Shower Filter Facts

Shower filters are designed to reduce exposure to chemicals and chemical vapors. Hot water creates a steam vapor that contains the volatile chemicals in the water; these vapors are inhaled and go directly to the bloodstream. Research has shown that people can inhale up to 50% more chlorine and other volatile organic compounds (also called VOCs), including chlorofluorocarbons, pesticides and chloroform, in one 10-minute shower than if they drank two liters of water containing the chemicals. A warm shower also opens up the pores of the skin, resulting in a high rate of VOC absorption. In addition, chlorine has a very drying affect on skin and hair.

Shower filters remove chlorine with an ion-binding zinc and copper media called KDF (kinetic degradation fluxion). As chlorinated water flows through the media, the dissimilar metals in KDF create a galvanic (also called electrolytic) reaction that causes the two chlorine ions to combine with a zinc ion. This turns the chlorine into harmless zinc chloride (ZNCL₂).

KDF also bonds with several types of heavy metals, including mercury, lead and copper, removing excess amounts of these metals from the water.

Shower filters are available in all price points to suit different needs and budgets. The least expensive ones have KDF only. More expensive filters also have carbon, which removes other chemicals besides chlorine. Carbon also is useful for water that has a lot of sediment, which can clog the filter. At the top of the price scale are shower filters with magnets and other energizing media. These filters not only remove contaminants but also hydrate the body more quickly and have an antioxidant effect to help with damaged skin and hair.

Shower filters need to be changed at least once a year. You may need to change the cartridge twice a year if more than two people use the shower, if you take long showers, or if your water is very sediment-heavy.