Compatibility: This replacement filters are ONLY compatible with 230oz 1.8GAL 7L Dog Water Fountain with 5 Layer Filter; Four Layers Of Filtration Ensure That Every Drop Of Water Is Fresh: Activated carbon eliminates bad odors; non-woven fabric captures cat hair and impurities; and sponge filters debris to prevent clogging and damage to pump. Maximum protection for your pet's healthy drinking water; 6/12 Pack Water Fountain Filter Replacement: Included 6/12 packs of replacement filters, 6/12 packs of replacement pre-filter sponge and 6/12 mesh-filters. Multi-effective filtration ensures that pets drink fresh water; Frequency Of Replacement: Please soak the filter in water for 5 minutes before use and rinse thoroughly under running water. Replace the cat water dispenser filter once in 1-2 weeks in summer and once in 2-4 weeks in winter to ensure clean drinking water. More frequent changes if more than one pet is using the water fountain; Warm NOTE: Christmas is coming and we will include a Christmas card that you can give to your friends or family as a Christmas giftBy the way: Merry Christmas