filters filter better, better, and last than other inferior filters. At the same time, adding a -filter sponge around the pump can better filter impurities and prolong the service life of the pump. Filtration: Composed of a cotton layer and activated carbon. Effectively to filter hair, heavy metals to water standrand. Keeping the drinking fountain clean is an for pet health. Helps pet to increase water consumption and reduce the risk of urinary tract infections. Compatible with most stainless steel fountains rinse filter use. We recommenced changing filter 2-3 weeks. color:White + black Material:sponge Package Contents: 12 x filter 12 x sponge filter 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.