This Clarity Replacement Filter Cartridge is designed for use with clarity, a ceramic water filtration system created to provide people with safe drinking water where water is biologically unsafe for consumption. By filtering out more than 99% of bacteria and protozoa, Clarity provides up to 40 liters of safe water each day - enough for a small family. The Clarity filtration system is incredibly simple to use and maintain, with instructional videos and user manual available online.