Many people feel the water supplied by public water systems to their home faucets is not safe. Most people judge the quality of their water by taste, odor and appearance. But the risk to one's health cannot be judged by these factors. Many of the chemicals or biological organisms that affect one's health are tasteless, odorless and cannot be seen. In searching for a means to improve the safety to their drinking water they encounter water filters, water purifiers, activated carbon (AC) filters that are common names for home drinking water treatment devices. In reading the labels, boxes and instructions on these devices to choose a reliable device, a consumer can become confused as to what the devices are able to remove from the water, by what means do they remove contaminants and how reliable these devices are. The U.S. Environmental Protection Agency (USEPA) has defined three general categories of home drinking water treatment devices.

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