6pcs Cat Water Fountain Filter with 4 Filtration Layers, Replacement Filters for 3L Automatic Water Fountain for Cats and Dogs

【Quadruple Filtration System】 Mesh gauze: Preliminary filtration of debris and hair; High-density cotton fiber: Secondary filtration of sediment and pollutants; Deep filtration of chlorine by activated carbon, eliminating unpleasant odors and improving taste; The cation exchange resin reduces heavy metal ions that cause urinary stones in pets. [Easy to replace] It is recommended to replace the filter after 3 to 5 weeks of use; simply snap it into the groove under the lid. One purchase lasts 4 to 8 months.