Features: CompatibilityCat water fountain filter replacement is compatible with 170oz/1.3Gallon/5L large DF10/DF30 dog water fountain. Triple Filtration SystemDog water fountain filters has triple filtration system, high-density cotton sponge stop hairs and residue, keep water clean; Activated carbon layer can remove chlorine and odor, purify and freshen water; Ion exchange resin can remove heavy metals and improve taste, effectively maintain water quality, increase oxygen content, keep water healthy for your pets. How to ReplaceBefore replacing this pet water dispenser filter, please soak the filter in water for 10 minutes and rinse the filter thoroughly under running water. Replace RegularlySuggest replacing the pet water bowl filter every 2-4 weeks, please change it more often if your water fountain serves for multiple pets. Protect Your PetThis cat/dog sponge filter for water fountains is made of high-quality materials, safe and odorless. It plays an important role in improving water quality and protecting the health of pets' urinary systems to keep your pet healthy. Specifications: Colors: Blue&White/Black&White (Optional) Pack: 4 Pack/8 Pack (Optional) Material: Activated Carbon+Cotton+Resin Item Size: 165*40*23mm Package Size: 17 x 8.9 x 6.2 cm Package Weight: 50g Package list: 4*Filters