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Learning Center Categories: Water And Health Learn About Water Quality Water Can Heal! Contaminants Fact Sheets Top Water News       Did you know? Reverse osmosis is the finest water filtration method known. This process will allow the removal of particles as small as ions from a solution. It is used to purify water and remove salts and other impurities in order to improve the color, taste or properties of the fluid. R.O. uses a membrane that is semi-permeable, allowing the fluid that is being purified to pass through it, while rejecting other ions and contaminants from passing. This technology uses a process known as crossflow to allow the r.o. membrane to continually clean itself. This is the reason of why an r.o. element can last many years before clogging or need replacement. This water purification process requires a driving force to push the fluid through the membrane, and the most common force is household water pressure or pressure from a booster pump. The higher the pressure, the larger the driving force and efficiency.

Water And Health   Learn About Water Quality     Water Can Heal!   Contaminants Fact Sheets   Top Water News Bottled water tested with contaminants Unsafe tap water for Californians Studies find 40 chemicals & 20 pesticides in water— Yet officials claim no health threat! Filters best way to clean tap water Novel Forward Osmosis Desalination Water sources of Dasani-pure? Question the safety of bottled water Unsafe water vending machines? Turn humidity into drinking water Perchlorate pollution for 20 million people Perchlorate and its health risks Water shortages:poor management of water resources & soaring water usage Dying for a drink of clean water New WHO report tackles fluoride Pollution from Sewage Spills Lead in school's drinking fountains Latest Chromium pollution Lettuce contaminated with Perchlorate Intersex fish signal presence of pollutants Cooking tips to avoid Bacteria infection Study Finds Traces of 40 chemicals and 20 pesticides in our drinking water -- Yet claims these contaminants pose no health threat! Study Finds Traces of 40 chemicals and 20 pesticides pose no health threat!-- U.S. Geologic Survey says. By Janet Wilson, Times Staff Writer Los Angeles Times, (Thursday) It may not taste very good, but it's safe. That's the conclusion reached by U.S. Geological Survey scientists who surveyed drinking water supplies in Orange, Riverside and San Bernardino counties. Although trace amounts of nearly 40 industrial chemicals and 20 pesticides were found in groundwater used by 3.5 million people in the Santa Ana River watershed, which covers portions of the three counties, none was in a concentration that poses a danger to the public, officials said. The geological service sampled 200 wells across the three-county area from 1999 to 2001 and found that more than half contained trace amounts of carcinogens and other dangerous, volatile organic compounds and pesticides. The study also found that nearly half of wells used for production of drinking water exceeded standards for dissolved solids, or salty residues, which affect taste. "While it may not be the best-tasting, the water quality does meet EPA health standards," said Ken Belitz, a USGS hydrologist and program chief who oversaw the project. "We definitely know now why Southern Californians drink more bottled water than New Yorkers." Federal scientists, state water-quality monitors and local water district managers said that although the tiny amounts of toxins detected were not dangerous, they did indicate how widespread human activity in the watershed has been. "It's a little bit humbling the extent to which human-manufactured compounds are present in deep groundwater," Belitz said. Those toxins include chloroform, industrial solvents, refrigerants and the gasoline additive MTBE. Kurt Berchtold, assistant executive officer of the Santa Ana Regional Water Quality Control Board, the regional arm of the state's water regulatory agency, said that with the exception of MTBE, a gasoline additive now being phased out, "those are really the legacy pollutants." "They are in the groundwater as a result of poor historic practices ... rocket testing and a lot of much smaller businesses, especially electronics manufacturers, metal plating factories and auto shops." He and others said that in the 1950s and '60s, the dangers of such pollutants were not known. Since then, tough regulatory practices have been instituted. As for the salinity, it is more pronounced in coastal areas, the survey found. Snowmelt from the San Bernardino Mountains provides better-tasting water, but more heavily populated areas in Orange County have water that has been imported or recycled several times through pipe systems. Ron Wildermuth, head of the Orange County Water District, said that water imported from the Colorado River had high salinity, as did locally recycled water. Overall, he said the average salinity in the Orange County water basin is 465 milligrams per liter, less than the 500-milligram "aesthetic" level set by state law.

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