★【Keep Your Pet Healthy】This pet fountain sponge filter can catch fur, and any food re-sidue, making the water cleaner and fresher, keeping your pet healthy. And help prevent kidney dis-ease, urinary tract in-fection, etc. ★【High-Quality Material】The filter element is made of non-woven fabric, activated carbon and natural resin, which can filter out debris and remove odor and impurities, improving water quality. A pre-filter sponge captures any dirt or hair to protect the pump. Let the water dispenser work safely. ★【Easy To Use】Just put the raised side up and the flat side down for easy installation. Rinse the filter with water before use. An effective filtration system keeps the water clean and fresh. ★【Wide Compatibility】The size of the replacement filter is 7.6 x 4.2 cm. The inner diameter of the sponge is 6 cm. Compatible with most pet fountain water fountains. Please measure your fountain and check if the filter can be built into your fountain before ordering. ★【Recommendation】For best performance, clean the fountain at least once a week to prevent nasty chalk stains and co-rrosion from forming. Disassemble/clean the pump every two weeks. Replace filter every 2-4 weeks and pre-filter sponge every 1-2 months. 4 pack filter and pre-filter sponge included, enough to keep water fresh and clean for 2 to 4 months.