CuZn KR-101N Wide Spectrum Water Filter Replacement Cartridge New look, same incredible performance! We have improved our housings durability Filters over 600 types of contaminants including heavy metals, chlorine, herbicides, pesticides, many pharmaceuticals & more Breaks down contaminants in 3 stages, a proprietary reticulated KDF-55 stage, high purity  acid washed coconut shell GAC stage & a 5 micron sediment/particulate stage We recommend replacing this filter every 10,000 gallons or once a year, whichever comes first