【Triple Filtration】: The filter is made of resin and activated carbon, which can filter cat hair, debris and coarse dust, heavy metals and other odors and impurities, and only provide clean and healthy water. 【High Compatibility】: 12cm*12cm. Compatible with flower fountains, for example: suitable for Rhodesy, Aolvo, Focuspet square flower fountain. Note: Not suitable for Catit fountains. 【Best Replacement】: Compared with ordinary activated carbon filters, our filters have a longer service life and lower replacement frequency. We recommend changing the filter every four weeks to keep the water clean. 【Easy to Use】: Please soak the fountain thoroughly before use. Then insert the cat fountain filter into the water dispenser. Provide cats with fresh, healthy water.