[High Density Sponge]Cat Water Fountain Filters Sponges Foams, Compatible with Multi Pet Fountain Replacement Filters for Cat Fountain Safe Material: The foam filter is a biological filler synthesized materials that is safe for your pets. You can use it worry-free. Protecting the Pump: It can better filter the hair and prevent the food residue from clogging the pump and extend the life of the fountain pump. Keeping Health: Clean and flowing water supply will provide your pet with clean, fresh water which is very important for their health. [Recommendations]Please soak the filter in water for 2 minutes and rinse it thoroughly under running water before use and change the filter every 2-4 weeks. tip: excluding pump Material: foam cotton colour: Black Package Contents: 12 x U-Shaped Filter Cotton Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.