The majority of ground water is naturally filtered as it travels through layers of the earth into underground reservoirs called aquifers. Water that suppliers pump from wells commonly contains less organic material than surface water and may not need to go through any or all of the treatments at any one time. The quality of the water may depend on local environments. The most regular drinking water treatment, considered by many to be one of the most essential scientific discoveries of the 20th century, is disinfection.
(A lot of|The majority of|Most} water treatment suppliers add chlorine or another disinfectant to eradicate bacteria and other germs. Water suppliers use a selection of treatments as required, according to the quality of their source water. For example, systems whose water is contaminated with organic chemicals can treat their water with water filters, which will aid greatly in purification of the water.
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