【Quadruple filtering】: The filter is made of resin and activated carbon, which can filter the water of odors and impurities, such as cat hair, gravel and coarse dust, heavy metal, and provide only fresh water for cats, dogs and other pets. 【High Compatibility】: Suitable for most 1.6L, 2.0L, 2.0L cat fountains .4 L like DADYPET, PETACC, YOUTHINK and Hommii water fountains - Note: Not suitable for Catit cat fountains 【Timely replacement】: To ensure clean water, the filter must be replaced on time. We recommend replacing the filter every four weeks to keep the water clean. 【Easy to Use】: Thoroughly soak the fountain with water before use. Then insert the cat fountain filter into the water dispenser.