Features: The foam filter can filter out dirty conservancy of the water, and maintain the fountain's flow rate to protect the health of your pets. Enough quantity of pet foam filters can meet many replacement needs for those who keep many pets, and they are easy to install and replace. Easily removes for pump cleanings and foam filter replacement. We suggest to change every 2-4 weeks to maintain your pet water fountain and keep the water fresh and clean. Compatible with PetSafe Drinkwell Avalon, Seascape, Pagoda, Sedona, Butterfly, Creekside, Seaside, Stainless Multi-Pet, 1/2 Gallon, 1 Gallon & 2 Gallon Pet Fountains. Specifications: Material: sponge Color: as the picture show Size: as the picture show Package includes: 30 x Pet fountain filters Notes: Due to the product packaging, sometimes, there may be some deformation, but it does not affect the use, and it can be restored after being opened for a period of time. Manual measurement, please allow slight errors on size. The color may exist a slight difference due to different screen displays.