Hotter Isn’t Necessarily Better When It Comes To UV Output

Most ultraviolet systems that are used to disinfect water flowing at less than 40 gallons per minute use what are called “low-pressure” UV lamps.  These lamps contain a small amount of mercury, which vaporizes when current flows through the lamp, producing what is considered the ideal “germicidal” UV wavelength of 254 nanometers.

The ideal dosage of 254 nanometers, however, is dependent on some variables, and not the least of these is temperature.

UV designers speak of the “cold spot” on the lamp.  That is the coolest section on the lamp surface.  The “cold spot” should be at about 108 degrees (42 C.) for the UV unit to operate at the optimal 254 nanometers. As the temperature of the lamp changes, so does the dosage from the lamp.

In standard residential UV units the germicidal lamp is enclosed in a transparent tube called a quartz sleeve.  The sleeve is immersed in water.  It surrounds the lamp and protects it from exposure to water.  Although water does not touch the lamp, the temperature of the water affects the lamp temperature since it cools the air between the sleeve and the lamp.  A change in water temperature, therefore, can have a dramatic effect on the temperature of the lamp itself and consequently on the performance of the UV unit.

How Temperature Affects UV Output

There is an assumption that the higher the temperature within the UV treatment chamber, the greater the effectiveness of the UV unit at disarming pathogens. Not so.  In fact, varying in either direction from the ideal cold spot temperature results in diminished performance.  Cold water can lower the cold-spot temperature so that the UV output will drop as much as 50 percent below its maximum. Hot water around the quartz sleeve will also lower the UV output by as much as 50 percent.  Ideal water temperature for operating a UV unit with the lamp inside a quartz sleeve  is about 22 C (71 F).

One factor that is seldom considered in UV planning is that water standing in the UV treatment chamber can become very hot.  In undersink UV units,  the elevated temperature can send aesthetically unpleasing tepid water out of the spigot, but what is worse,  elevated heat can also  reduce the efficiency of the UV lamp.  This could be a problem if a long period of  inactivity is followed by a period of high flow rate.

Some modern UV manufacturers, like Viqua,  offer an optional solenoid-controlled feature that moves water through the system periodically to prevent heat build-up.

Fatberg


Posted August 8th, 2013

Fatberg ahead! How London was saved from a 15-tonne ball of grease 

Team of sewerage workers took three weeks to clear bus-sized toxic ball of fat that threatened to flood streets with sewage.

A sewage worker has become an unlikely hero after taking three weeks to defeat a toxic 15-tonne ball of congealed fat the size of a bus that came close to turning parts of the London borough of Kingston upon Thames into a cesspit.

The first sign of trouble came when residents in a block of flats near the royal borough’s main sewer reported difficulty flushing their toilets. Gordon Hailwood and his team found a “fatberg” of solidified grease and oil blocking 95% of the 2.4 metre diameter brick sewer pipe. It took three weeks working in foul conditions to clear with high powered water jets.

“Kingston came very close to being flooded with sewage. We have recorded greater volumes of fat in the past but we don’t believe there’s ever been a single congealed lump of lard matching this one”, said Simon Evans, a Thames Water spokesman.

Not a good likeness. 15 ton blobs of grease are not photogenic.

 

Fatbergs build up on sewer roofs like mushy stalactites. “I have witnessed one. It’s a heaving, sick-smelling, rotting mass of filth and faeces. It hits the back of your throat, it’s gross,” said Evans.

“It’s steaming and it unleashes an unimaginable stink. Hailwood and his team certainly saved Kingston from a terrible fate.”

Water and sewage companies say fatbergs are becoming more common. London, with the highest concentration of food businesses in the country, produces an estimated 32m-44m litres of used cooking oil every year, much of which is poured down drains.

Also, the use of wet wipes as toilet paper is increasing, with potentially disastrous results below ground.

Thames Water says it has to clear nearly 40,000 blockages a year caused by fat and sanitary wipes being wrongly put down drains by restaurants and households. “We have 59,000 miles of sewer and fat and wet wipes are the main partners in ‘sewer abuse’ crime,” said Evans.

“The wipes break down and collect on joints and then the fat congeals. Then more fat builds up. It’s getting worse. More wet wipes are being used and flushed. It took Hailwood and the guys three weeks to flush this one out with high-powered water jets.

“Given we’ve got the biggest sewers and this is the biggest fatberg we’ve encountered, we reckon it has to be the biggest such berg in British history,” said Hailwood.

“The sewer was almost completely clogged. If we hadn’t discovered it in time, raw sewage could have started spurting out of manholes across the whole of Kingston. It was so big it damaged the sewer and repairs will take up to six weeks.”

However – in what environmental groups call a “win-win” development – waste fat is now being used to generate renewable energy. McDonald’s collects more than 600,000 litres of used cooking oil from its London restaurants each year, converting it to biodiesel to run half its fleet of lorries. London mayor Boris Johnson is pressing for waste fat to be used to run London’s buses.

“By capturing it right here in London and turning it into biodiesel we could provide 20% of the fuel needed to power London’s entire bus fleet while saving thousands of tonnes of CO2 and creating hundreds of new jobs. There is huge potential to unlock the value in used cooking oil and turn it to our economic advantage,” Johnson said last week.

One consortium plans to generate 130 gigawatt hours (GWh) of renewable electricity each year – enough to run 39,000 average homes – by burning 30 tonnes a day of fat, oil and grease. The oils will be collected from food outlets and manufacturers, and solidified grease will be harvested from “fat traps” installed in restaurant, hospital, stadium and factory kitchens. Thames Water has agreed to buy half the electricity to run London’s largest sewerage works at Beckton.

Keeping drains clear

• Animal fats and vegetable oil, lard, grease, butter and margarine, food scraps and dairy products all contribute to blocked drains, “fatbergs” and sewer blockages. Waste disposal units do not remove fats.

• Wipes, nappies, sanitary towels, rags and condoms do not break down easily and can snag on pipes, drains and the walls of sewers, leading to blockages.

• Pesticides, battery acids, nail polish, motor oil, chlorine-based and other cleaning products, paints and photographic chemicals are all toxic waste and should be disposed of carefully because they do not break down in sewage systems and can pollute rivers and sea water.

• If you have a septic tank, then be extra careful. Don’t flush medicines, coffee grounds, paper towels or egg shells, or anything that breaks down slowly, down the toilet or sink.

Source: The Guardian.

A Picture Story of the Effects of Drought on a North Texas Lake

 

Lake Bridgeport was closed for a time just three years ago… because it was too full.

The scenic North Texas lake is now [August of 2013]  down 19 feet in places.  The resort area of the lake, known as Runaway Bay, is the area where the low water level is most apparent. As the water falls in the lake, so do the profits of local business that depend on tourism.

 This floating gas dock which is supposed to be level is held in place now only by its hinged attachment to the shore. Lake Bridgeport is 19 feet below its normal level. It has received nearly 7 inches less rain than the official totals at Dallas/Fort Worth International Airport, 50 miles to the southeast.

Boat docks that are normally accessible only by footbridge are now well above the lake’s surface. The lake depends on rain for its water, and when it doesn’t rain, the level drops quickly.  During the current drought, the level of the lake is dropping 1/2 inch per day.  That translates to 60 million gallons of water per day lost to evaporation.

Reference Source: WFAA News.

Hot days cause massive evaporation

Water News in a Nutshell.

 

In A Nutshell: Water evaporates from lakes and rivers, but most of us don’t realize how much surface water evaporates or what factors influence the amount.  The piece below, adapted from a Lawton, OK newspaper, answers some of these questions.

Not all the water disappearing from Lawton area lakes is reappearing as streams pouring out of water faucets.

Summer in Oklahoma means sun and wind, two of the components in an equation that could cost two area lakes 100 million gallons of water a day through evaporation. That’s five times the average amount of water the city treats daily to serve Lawton, Fort Sill and its other water customers, and three times its peak daily water treatment, according to information from the City of Lawton.

Lawton officials have said their two closest sources of raw water  Lake Lawtonka, which feeds the Medicine Park Water Treatment Plant, and Lake Ellsworth  lose an average of 25 million gallons of water a day (mgd) and 50 mgd, respectively, in the summer to evaporation. The potential rates are even higher at Waurika Lake (Lawton’s third and largest source of raw water) and Lake Lugert-Altus. Waurika Lake can lose an average of 100 mgd to 120 mgd in the hot summer months, while Lugert-Altus’ potential loss is 49.2 mgd to 98.4 mgd.

Calculating or even explaining evaporation rates is complicated, because of the variety of factors that influence it.

Dave Taylor, manager of the Waurika Lake Master Conservancy District, said the Corps of Engineers, which controls Waurika Lake, looks at four variables, starting with relative humidity. The lower, the humidity, the easier it is for water to evaporate.

“Higher humidity is good,” Taylor said, admitting the high humidity rates blanketing the area may be miserable for humans, but they are good for lakes. “In most the research I’ve done, the relative humidity is the key.”

Temperature also has an effect, as does the amount of radiant heat from the sun. Another variable is wind speed: The more wind that travels across a lake, the more water it picks up. Taylor said to think of this as the cooling effect of water on your skin when a breeze blows across it.

“That water is evaporation,” he said.
Tom Buchanan, general manager of the Lugert-Altus Irrigation District, agreed wind is a factor, but said evaporation also is based on how high the water level is and how big the surface pool is: The larger the pool, the more exposed the water within is to environmental factors.

“A lake at its highest capacity is the most prone to evaporation,” Buchanan said, noting that has become less of an issue at Lugert-Altus, which is at an historically low elevation because of severe drought.

Buchanan said the evaporation rate varies, even on the same lake, due to weather conditions. But he can make some general statements.

“I really think the average evaporation rate in western Oklahoma is about 60 inches. It varies. We can lose water to evaporation every day of the year, but it escalates when those factors are highest,” he said..

Source: The Lawton Constitution.

Gazette Fair Use Statement


Happy Garden Hose Day

If you were unaware that today is National Garden Hose Day you must live under a rock.   The phenomenal rise in popularity of Garden Hose Day is nothing short of amazing, and many experts in holiday marketing believe that National Garden Hose Day will soon rival not just the lesser national holidays like President’s Day, but it may soon eclipse traditional favorites like Father’s Day and Labor Day.

This year’s Garden Hose Day was enthusiastically celebrated in most American cities–from as far south as Brownsville to as far north as Wasilla.  As was the case in 2012, Minneapolis was the unchallenged epicenter of Garden Hose Day activities, with public offices and major businesses closing Monday to allow Twin Cities residents a full three-day weekend for the celebration.  Minneapolis and St. Paul square off each August 3 in the traditional Garden Hose Pull event.  The rivalry is intense and the competition brutal. Minneapolis leads the series by two wins, but St. Paul is a slight favorite in this year’s event  because of the acquisition of All Star puller Paul Browning from the Cleveland Pack Mules.

This bas relief rendering of a garden hose pull from antiquity demonstrates that hoses were in use much earlier than previously believed.  The thick, primitive hose used in this event was quite unlike the sleek but extremely strong hoses used in today’s competition.  Official garden hose pulls actually use specially manufactured hoses that are much stronger than conventional garden variety hoses. The stronger hoses were developed for safety after a St. Paul point puller lost an eye when a tightly stretched hose popped during the 2010 competition.

A new competition that emerged in several cities during this year’s Garden Hose festivities was the so-called Hose Blast. In this event, the player attempts to catch a burst of water from a fire hose in his mouth and squirt it back into the face of the friendly fireman.  The event’s future is uncertain, since several injuries were reported this year,  including a number of loose teeth.

Billy Meredith of Des Moines, Iowa was unable to withstand the jet of water dealt him by fireman Bob Withers in the Hose Blast event held at the Des Moines Civic Center. Although Billy was a favorite with the crowd, he did not qualify for the main competition. 

A Bright Future for Garden Hose Day

According to Esperanza Lopez,   research analyst for the National Federation of Merchant Associations,  holidays sink or swim according to their commercial appeal.  Holidays don’t get popular by accident.  Mother’s Day was a flop, Lopez points out,  until florists caught on that promoting it was an extremely successful way to sell flowers.

Lopez explains that for a holiday to really take off, it needs two things: commercial appeal and a nostalgic hook. Groundhogs are cute, but Groundhog Day comes in only slightly above zero as a national holiday because you can only sell so many stuffed groundhog toys and nobody has any happy childhood memories about groundhogs. Christmas, to the contrary, is the perfect holiday because the “good will toward men” theme is so generalized that almost any product can be associated with it.  Hard as it is to believe, people even give their loved ones guns for Christmas. And as for nostalgia, even a second-rate marketer can whip people into a buying frenzy by evoking happy white Christmas of childhood.  Even people who grew up on the Arizona desert remember blissful white Christmases of their youth when Bing starts to sing.

Garden Hose Day has wide product association plus an easy nostalgic appeal.  Almost everyone has memories of

Happy days of summer. Garden hoses take us back to the Good Old Days.

happy days of summer that involved hose spraying and lawn sprinklers and plastic wading pools filled with cool water from the garden hose.

As for the commercial side,  Esperanza Lopez points out that there are an exceptional number of products that relate to the garden hose.  In addition to the almost limitless array of decorative hoses, there are special nozzles, colorful hose bibs, manual and electrically-powered hose dispenser/retractors,  hose splitters, hose repair kits, hose unions, hose protectors, and more.  Related items include lawn equipment, car wash paraphernalia,  clothing,  books about gardening, patio cooking, landscaping and washing cars, patio furniture, lawn sprinklers,  gardening tools–the list is endless. Yes, even x-rated products that include sex toys and clothing with suggestive phallic mottoes and pictures were on the market this year.

One of the more serious products that has benefited from the popularity of Garden Hose Day is the garden hose filter. According to manager Katey Shannon of Pure Water Products,  a leading seller of garden hose filters, “We sell garden hose filters year around, but sales really take off in the month before Garden Hose Day.”  Shannon points out that garden hose filters enhance the hosing experience, whether you drink water from a garden hose, spray water on your lawn or vegetable garden, wash your car, or fill your horse’s water trough. “Whatever you do with a garden hose,” Shannon says, “you will enjoy it more if your water is filtered.”

So live it up on Garden Hose Day.  August, the hottest month and the last month of summer vacation, needs a great holiday.  Let’s face it.  No one wants to celebrate the day we bombed Hiroshima and no one wants to buy gifts to commemorate LBJ’s Birthday.  Garden Hose Day!  A holiday America can be proud of.

  For the Dog Days of Summer, there’s nothing like a garden hose to make you happy. 

Walk For Water Ends


Posted August 3rd, 2013

Walk for water charity cut short after 5,000 miles

The Gazette gives its highly coveted Hero Award to Amy Russell who walked 500o miles for a very good cause.  Below is the Independent’s account of her adventure.

After 5,000 miles and 18 months, Amy Russell is done walking.

The 24-year-old Manchester native and founder of the charity Walking4Water has ended her trek through Africa, six months and 2,000 miles earlier than planned.

Health problems and political unrest in her planned destination of Egypt caused her and walking partner Aaron Tharp to stop their walk, she said. They plan to fly home on Sunday.

Amy Russell at a watering hole in Mozambique in August of 2012. She walked on for another year after the photo was taken.

“I guess `officially’ we ended in Negele, Ethiopia,” she said via Facebook chat from Addis Ababa, the Ethiopian capital. “Random town … but the point where everything plus people throwing rocks at us every day just, where we decided to be done.”

Russell and Tharp, 26, of Trenton, Ohio, were the last two walkers standing from a journey that was supposed to include about 10 people.

It was designed to call attention to the lack of access to clean water in developing countries. The walk has raised about $10,000 for charity: water, a New York-based group that funds drinking water projects in developing countries.

Most of the other would-be walkers backed out before Russell’s journey began in South Africa in February 2012. A third member of the team, 25-year-old Marty Yoder of Elkhart, Ind., who had been driving the support vehicle, went home with health problems when the team was in Mozambique.

That left Russell and Tharp with their shoes and backpacks. They camped or stayed with missionaries or local families, traveling north through South Africa, Mozambique, Malawi, Tanzania, Kenya and Ethiopia. Russell went through seven pairs of shoes and lost about 40 pounds.

“The biggest challenge was probably just living in constant instability, we never stayed in one place very long,” Russell said. “So every day, we had to find food, had to find water, had to find a place to stay. Always dealing with a language barrier, always changing circumstances. Dealing with that mentally was probably the hardest.”

They had physical problems as well. Russell contracted malaria in Mozambique. They both got sick a number of times from drinking brackish water, and Tharp developed knee problems, Russell said. They also spent one night in Kenya huddled in a tent with a machete after noticing lions in nearby bushes.

Russell called it the most terrifying experience of her life.

“Throughout the remainder of the night, we heard yet another lion, another elephant, a two-minute lion-elephant showdown, and a couple hyenas,” Tharp wrote on his blog. “Morning never looked so beautiful!”

But it was the people that Russell said will leave a lasting impact on her.

She recalled a day she spent in a Kenyan village, going with other women and children to gather water from a hole that was a 15-minute walk away.

“From this `puddle’, maybe you could call it a small pond, we filled the jerry-cans, and walked back with them,” she said. “This water, murkier than potato soup, was what they drank directly from, without any fears or qualms.”

Russell is disappointed she wasn’t able to walk all 7,000 miles, but she’s proud she made it as far as she did.

“Instead of transforming everyone else’s life (I’m not sure I made a huge impact for others), it seems my life has been the one transformed in the process,” she said.

Russell hasn’t decided what she will do next. She will begin looking for a job and is considering graduate school.

For now, she just wants to be home, perhaps with a pizza.

“I definitely plan on doing talks, sharing the experience if people are interested,” she said. “Not sure writing a book is a good idea, but haven’t eliminated the option completely. NO MORE WALKING lol.”

Source:  TheIndependent.com

Pure Water Gazette Fair Use Statement

  UV for Chlorine/Chloramine Reduction

Gazette’s Introductory Note.  The following short article from UVSciences.com gives a very general view of some alternative uses of ultraviolet in water treatment. UV is widely accepted as a method of water disinfection, but it is not so widely known as a treatment for TOC  (Total Organic Carbon) and the reduction of chlorine and chloramine.  The article does not explain that these special uses require special equipment and the regular 254 nanometer low pressure lamps that are used for destruction of bacteria and viruses cannot simply be applied to the treatment of  TOC or chlorine/chloramine.  Each of these requires specific wave lengths and chloramine reduction is done with a medium pressure lamp.  At present chloramine reduction with UV is mainly used for swimming pools, but other uses are being developed.–Gene Franks.

Chlorine and chloramine are used extensively for water disinfection.  These compounds, and related byproducts, such as trihalomethanes (THM’s), are often present in water supplies. These compounds must frequently be removed because they are potential health hazards, and they may affect the taste of consumable products, such as flavored beverages and bottled water. Removal is also necessary because chlorine and chloramine based compounds can significantly increase the operational/maintenance costs for purification equipment, such as ion-exchange beds and reverse osmosis (RO) membranes, all used for ultrapure water processing.

UV is becoming more popular for destroying chlorine/chloramine compounds as the performance of UV lamps improves and the costs associated with traditional methods of removal become prohibitive. The mechanism used by UV to destroy chlorine/chloramine compounds is dissociation. The ultraviolet energy “breaks” the molecular bonds of the compounds reducing them to their basic elements. These basic elements will either combine with others to form benign compounds, or they can be subsequently removed in a downstream purification process.

Traditional methods for removing chlorine/chloramine are Granular Activated Carbon (GAC) filter beds, or chemical injection using sodium metabisulfite. Sodium metabisulfite can introduce undesirable byproducts into the water supply and it can create favorable conditions for microbial growth in RO membranes downstream. Sodium metabisulfite is also a potential health hazard that requires protected storage and careful handling.

Above, a very basic UV system. The quartz sleeve, lamp inside, inserts into the stainless treatment chamber. The simple control system provides both visual and audible warning of UV lamp failure. The system comes in 2, 6, 8, and 12 gpm versions. The lamps provide strong UV dosage (30 mj/cm2 at the end of the lamp’s life) that is certified by independent testing (BioVir). Very easy to install, the unit wall mounts with two simple clips.

Activated carbon beds used for chlorine/chloramine removal are susceptible to microbial proliferation, and they are vulnerable to “break-through”. As a result, it is necessary to inspect, clean, and replace activated carbon beds regularly, which requires costly downtime on manufacturing lines.

Case studies have shown that UV treatment prior to activated carbon beds and reverse osmosis membranes will reduce overall operating costs by increasing the time between cleaning cycles, and extending the life of both GAC beds and RO membranes. Ultraviolet treatment also provides additional benefits in the form of disinfection and TOC reduction, without affecting taste and without the creation of difficult to remove residuals.

 

http://www.uvsciences.com/chlorine.html

Pure Water Gazette Fair Use Statement

Tides, Energy, and the Colorado River

by Elizabeth Cutright

Water News in a Nutshell.

 

In a Nutshell: John Muir, founder of the Sierra Club, said that if you tug on one thing in nature you find it attached to the rest of the world.  With that in mind, it makes perfect sense that when a man in an apartment in Phoenix, AZ turns on his air conditioner,   flow in the Colorado River increases.  This will make sense after you read Elizabeth Cutright’s article.

In a lyrical piece written for The Nation, author William deBuys (A Great Aridness: Climate Change and the Future of the American Southwest) describes his time spent rafting down the Colorado River. As he details the changing landscape and the effects climate change and demand management (or mismanagement) have on this interstate tributary, deBuys also manages to address one of the most pressing issues facing water resource management today: the water-energy nexus.

The Colorado is “a tidal river” explains deBuys, going on to note, “these days, the tides of the Colorado are not lunar but Phoenician.” As demand rises from Phoenix, AZ, water levels dip and ebb in response.

“On this April night, when the air conditioners in America’s least sustainable city merely hum, Glen Canyon Dam, immediately upstream from the canyon, will run about 6,500 cubic feet of water through its turbines every second,” writes deBuys. He goes on to illustrate the interdependent relationship between the city’s energy needs and its water resources:

“Tomorrow, as the sun begins its daily broiling of Phoenix, Scottsdale, Mesa, Tempe, and the rest of central Arizona, the engineers at Glen Canyon will crank the dam’s maw wider until it sucks down 11,000 cubic feet per second (cfs). That boost in flow will enable its hydroelectric generators to deliver ‘peaking power’ to several million air conditioners and cooling plants in Phoenix’s Valley of the Sun. And the flow of the river will therefore nearly double.”

Of course, as the heat intensifies in that urban oasis, Phoenix residents will crank up the AC with little thought to effects those watts will have on the Southwest’s water resources.

For deBuys, the connections are clear and significant.

“By mid-summer, temperatures in Phoenix will routinely soar above 110 degrees Fahrenheit, and power demands will rise to monstrous heights, day and night. The dam will respond: 10,000 cfs will gush through the generators by the light of the moon, 18,000 while an implacable sun rules the sky. Such are the cycles—driven by heat, comfort, and human necessity—of the river at the bottom of the continent’s grandest canyon.”

Despite the drastic and significant effects of the energy and water needs of some of the region’s largest cities, few laymen ever make the connection.

“The subsequent story of the West can indeed be read as an unending duel between society’s thirst and the dryness of the land, but in downtown Phoenix, Las Vegas, or Los Angeles, you’d hardly know it,” writes deBuys.

In truth, the impact of this use (who some would undoubtedly label misuse or perhaps even abuse) of the Colorado has tendrils that stretch far and wide beyond green lawns in a desert-scape, or nonstop air conditioning during the hottest part of the day. As deBuys details, harnessing the power of one of “the West’s great waterways,” results in:

* Water for 40 million people
* Irrigation for 5.5 million acres of farmland
* The gradual (and perhaps irreparable) erosion of natural beaches and sandbars as a result of the hydroelectric tides
* Changing water temperatures—resulting from dam releases—aid nonnative species (like trout) to the detriment of indigenous populations of fish—some on the verge of extinction (and many protected under the Endangered Species Act).


The Colorado


The entire article is worth reading, as deBuys goes over the finer points of water rights, court decrees, and the eternal rain dance between supply, demand, and conservation.

One question deBuys asks at the beginning of his essay stuck with me to the end, “The crucial question for Phoenix, for the Colorado, and for the greater part of the American West is this: How long will the water hold out?”


Source: Water Efficiency.

Gazette Fair Use Statement

Arsenic in Drinking Water: Costly Change Could Lower Levels

By Douglas Main

Water News in a Nutshell.

 

Gazette’s Summary:  Let’s see.  Undiluted  fluorsilicic acid can eat through glass. When added to tap water it leaches lead out of water pipes. It adds both lead and arsenic to water. Using it causes an estimated 1800 cancers per year.  Not putting it into drinking water supplies would reduce arsenic in drinking water by 99 percent. But we will likely keep adding it because selling a manufacturing by-product is very profitable for the phosphate fertilizer industry.  This will be a tough decision for the EPA.

In early August, the Environmental Protection Agency is set to decide on a petition to change the source of fluoride in U.S. drinking water.Currently, the source of fluoride in most public water supplies is fluorosilicic acid, according to government records. The petition calls for the EPA to instead require the use of pharmaceutical-grade sodium fluoride in water fluoridation, which is the addition of fluoride to drinking water for the purpose of preventing cavities.

Fluorosilicic acid is often contaminated with arsenic, and recent research has linked the arsenic from fluorosilicic acid in drinking water to as many as 1,800 extra cases of cancer yearly in the United States, said William Hirzy, a chemistry researcher American University in Washington, D.C. Hirzy, who worked at the EPA for 27 years, submitted the petition. (more…)

6 Reasons to Drink Water

It’s no magic bullet, but the benefits of water are many.

by Kathleen Zelman

Introductory Note:  We don’t know why his article has only 6 reasons to drink water, since most of the thousands of articles that tell  you to drink water have at least 10.  Likewise,  it has only 5 tips to help you drink more water, while many articles have fifteen or more.  Since they are good reasons and good tips, though, we decided to offer it. Although recommending the drinking of water should fall into the same category as the breathing of air, it is surprising that many people drink little if any water.  These are usually high consumers of soft drinks.  They should read all six reasons and all five tips. –Hardly Waite.

Americans seem to carry bottled water everywhere they go these days. In fact, it has become the second most popular drink (behind soft drinks). But water lovers got a jolt recently when we heard that a new report had found that the benefits of drinking water may have been oversold. Apparently, the old suggestion to drink eight glasses a day was nothing more than a guideline, not based on scientific evidence.

But don’t put your water bottle or glass down just yet. While we may not need eight glasses, there are plenty of reasons to drink water. In fact, drinking water (either plain or in the form of other fluids or foods) is essential to your health.

This man is only half full and clearly needs to drink more water.

“Think of water as a nutrient your body needs that is present in liquids, plain water, and foods. All of these are essential daily to replace the large amounts of water lost each day,” says Joan Koelemay, RD, dietitian for the Beverage Institute, an industry group.

Kaiser Permanente nephrologist Steven Guest, MD, agrees: “Fluid losses occur continuously, from skin evaporation, breathing, urine, and stool, and these losses must be replaced daily for good health,” he says.

When your water intake does not equal your output, you can become dehydrated. Fluid losses are accentuated in warmer climates, during strenuous exercise, in high altitudes, and in older adults, whose sense of thirst may not be as sharp.

Here are six reasons to make sure you’re drinking enough water or other fluids every day:

1. Drinking Water Helps Maintain the Balance of Body Fluids. Your body is composed of about 60% water. The functions of these bodily fluids include digestion, absorption, circulation, creation of saliva, transportation of nutrients, and maintenance of body temperature.

“Through the posterior pituitary gland, your brain communicates with your kidneys and tells it how much water to excrete as urine or hold onto for reserves,” says Guest, who is also an adjunct professor of medicine at Stanford University.

When you’re low on fluids, the brain triggers the body’s thirst mechanism. And unless you are taking medications that make you thirsty, Guest says, you should listen to those cues and get yourself a drink of water, juice, milk, coffee — anything but alcohol.

“Alcohol interferes with the brain and kidney communication and causes excess excretion of fluids which can then lead to dehydration,” he says.

2. Water Can Help Control Calories. For years, dieters have been drinking lots of water as a weight loss strategy. While water doesn’t have any magical effect onweight loss, substituting it for higher calorie beverages can certainly help.

“What works with weight loss is if you choose water or a non-caloric beverage over a caloric beverage and/or eat a diet higher in water-rich foods that are healthier, more filling, and help you trim calorie intake,” says Penn State researcher Barbara Rolls, PhD, author of The Volumetrics Weight Control Plan.

Food with high water content tends to look larger, its higher volume requires more chewing, and it is absorbed more slowly by the body, which helps you feel full. Water-rich foods include fruits, vegetables, broth-based soups, oatmeal, and beans.

3. Water Helps Energize Muscles. Cells that don’t maintain their balance of fluids and electrolytes shrivel, which can result in muscle fatigue. “When muscle cells don’t have adequate fluids, they don’t work as well and performance can suffer,” says Guest.

Drinking enough fluids is important when exercising. Follow the American College of Sports Medicine guidelines for fluid intake before and during physical activity. These guidelines recommend that people drink about 17 ounces of fluid about two hours before exercise. During exercise, they recommend that people start drinking fluids early, and drink them at regular intervals to replace fluids lost by sweating.

4. Water Helps Keep Skin Looking Good. Your skin contains plenty of water, and functions as a protective barrier to prevent excess fluid loss. But don’t expect over-hydration to erase wrinkles or fine lines, says Atlanta dermatologist Kenneth Ellner, MD.

“Dehydration makes your skin look more dry and wrinkled, which can be improved with proper hydration,” he says. “But once you are adequately hydrated, the kidneys take over and excrete excess fluids.”

You can also help “lock” moisture into your skin by using moisturizer, which creates a physical barrier to keep moisture in.

5. Water Helps Your Kidneys. Body fluids transport waste products in and out of cells. The main toxin in the body is blood urea nitrogen, a water-soluble waste that is able to pass through the kidneys to be excreted in the urine, explains Guest. “Your kidneys do an amazing job of cleansing and ridding your body of toxins as long as your intake of fluids is adequate,” he says.

When you’re getting enough fluids, urine flows freely, is light in color and free of odor. When your body is not getting enough fluids, urine concentration, color, and odor increases because the kidneys trap extra fluid for bodily functions.

If you chronically drink too little, you may be at higher risk for kidney stones, especially in warm climates, Guest warns.

6. Water Helps Maintain Normal Bowel Function. Adequate hydration keeps things flowing along your gastrointestinal tract and prevents constipation. When you don’t get enough fluid, the colon pulls water from stools to maintain hydration — and the result is constipation.

“Adequate fluid and fiber is the perfect combination, because the fluid pumps up the fiber and acts like a broom to keep your bowel functioning properly,” says Koelemay.

5 Tips to Help You Drink More

If you think you need to be drinking more, here are some tips to increase your fluid intake and reap the benefits of water:

  1. Have a beverage with every snack and meal.
  2. Choose beverages you enjoy; you’re likely to drink more liquids if you like the way they taste.
  3. Eat more fruits and vegetables. Their high water content will add to your hydration. About 20% of our fluid intake comes from foods.
  4. Keep a bottle of water with you in your car, at your desk, or in your bag.
  5. Choose beverages that meet your individual needs. If you’re watching calories, go for non-caloric beverages or water.

Article Source:  WebMd.

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