Compatible with WF050 & WF100 cat water fountain fountains. This cat fountain filter replacement adopts with Sponge+Ion Exchange Resin+Activate Carbon-Triple filtration system, which attaches activated carbon and resin, effectively catch hair and debris, increase water quality, increase oxygen content and help prolong the life of your water fountain pump. High-density and high-content activated carbon filter effectively to filter hair, heavy metals. keeping your pet's water clean and . This cat fountain filter is easy to remove for pump cleaning and foam filter replacement. Please soak the water fountain filter in water for 10 minutes before use and rinse it thoroughly under running water. Water fountain filter will make your pet healthier because you're keeping your cat's and dog's drinking water the cleanest it can possibly be. Colour:Black & White Material:carbon fiber Package Contents: 16 * filter sponge Only the above package content, other 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.