cat water fountain filter and sponge

compatibleThe cat water fountain filters compatible with 20L67oz round stainless steel pet fountain ackackage includes 4 pack cat fountain replacement filters ilterEach cat water fountain filters contains cotton layer activated carbon and ion exchange resinFilter hair and residue remove odors and soften water getting better water tasting UseSoak the pet water fountain replacement filter in water for two minutes before using it for the first time requencyAccording to your pets drinking frequency and the number of pets using the cat fountain please replace the filter every 2 to 4 weeks