Features: Filter for exclusive use of the circulation-type waterer for pets. Perfectly designed for all GEX Pure Crystal Cat models. It removes dirt and other non essential water particles. Contains active carbon that adsorbs bleaching components of that water, making it superbly non-chlorine smell! Made from polypropylene, active carbon, polyethylene Size: 2 pieces per pack Product size (about) W155 X D155 X H 15mm Usage Guidelines: Wash the filter in a running water without using soap. When dirts, such as food debris, hair, etc are visible at approximately one month, please change the filter for exchange. Avoid direct sunlight, high temperature.