KDF 55 first of all is a heavy metal filter which is also able to remove chlorine & chloramine. The filter contains both KDF 55 proprietary filter media and coconut shell granular activated carbon. The KDF 55 filter removes: sediment, chlorine, lead, mercury, arsenic, copper, scale, lime, VOCs, THMs and much more. The Heavy Metal [KDF 55] Prefilter filters out heavy metals up to 99%. Prefilters need to be placed into housings. The Prefilters, themselves, are designed to last about a year. Fits standard sized housing [sold separately].
Heavy Metals The term heavy metal refers to any metallic chemical element that has a relatively high density and is toxic or poisonous at low concentrations. Heavy metals are natural components of the Earth's crust. They cannot be degraded or be destroyed. To a small extent they enter our bodies via food, drinking water and air. As trace elements, some heavy metals are essential to maintain the metabolism of the human body. However, at higher concentrations they can lead to poisoning.