Fluoridating potable water supplies
The filters produced by Brita and Pur use activated carbon for filtration. These filtration methods are recommended by the EPA (United States Environmental Protection Agency) and the WQA (Water Quality Association): Here is the document (PDF file) that states the WQA (Water Quality Association) recommendations. This filter has been certified by ISO 17025 accredited labs tests to remove 90% of fluoride in water.
The filter also removes lead (97.5%), chlorine (99.99%), chromium 6 (99.87%), mercury (99.6%), trihalomethanes (99.99%), DDT (98.8%). The FDA now requires that all fluoride toothpaste sold in the U. carry a poison warning that instructs users to contact the poison control center if they swallow it.
Reverse osmosis relies on pressure and a semi-permeable membrane to remove contaminants from water. Contaminants are trapped by the membrane and flushed away in the waste water.
The process requires between 2 and 4 gallons of water to produce 1 gallon of clean water.
In addition to the federal standards, most states have their own water quality laws, and some state laws are more stringent than those specified by the EPA. Most water contains varying amounts of dissolved minerals and salts, plus an abundance of suspended particles such as silt and microscopic organic material.
Different types of water are classified by the presence or absence of these impurities.
As long as there were no sources of contamination nearby, this was a satisfactory solution.Water is a chemical compound needed by most plants and animals on Earth in order to sustain life.Pure water is a tasteless, odorless, transparent liquid.Cholera, typhoid, and many other water-borne diseases took their toll.In 1800, William Cruikshank of England demonstrated that small doses of chlorine would kill germs in water.