【Perfect Compatibility】: The cat fountain filter replacement is ONLY compatible with oneisall 2L/67oz cat water fountain stainless steel, models: PWF-001.Please kindly check your fountain before order. 【Valuable Package】: Package includes 8 pack pump filters, 8 pack activated carbon filters and 8 pack blue porous filter. It's recommended to replace pet water filters replacement every 2 weeks to ensure cleaning efficiency. 【Safe material】: The filter for cat water fountain is composed of high density sponge, activated carbon, non-woven fabric and ion exchange resin. Safe to your pets and efficient to filter. 【Promote Health】: Multi-layer filtration system abosorbs odors, filters hair and removes heavy metal ions, ensuring your pets always drink the most clean and fresh water.Promote your pet's health. 【Warm Tips】:Please soak all pet water filters for 5 minutes and rinse for 1 minute before use to achieve the best filtering effect. The water fountain filters are easy to install and clean. 8 Sets Cat Water Fountain Filter Compatible with oneisall 67oz/2L Stainless Steel Cat Water Fountain, Activated Carbon Ion Resin Food Grade PP Cotton, Fresh and Clean