THMs, or trihalomethanes, are chemical compounds that are formed as a result of a reaction between organic materials in drinking water and chlorine added as a disinfectant. THMs are one of the many byproducts of water chlorination. When ingested in drinking water or absorbed from shower water, THMs can cause a host of physical problems. THMs are known carcinogens and leading causes of bladder and rectal cancer. THMs can adversely affect nervous system functioning, as well as trigger liver and kidney malfunctions.
THM’s are also called DBP’s meaning disinfection by products.
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