Check the listing for details. Replacement Water Filters Compatible With Petory 74oz/2.2L Pet Fountain, 10 Pack. Condition: New. Listed at 16.99 USD. PET STANDARD Replacement Water Filter & 10 Pack Replacement Pre-Filter Sponges Compatible With Petory® 74oz/2.2L Automatic Pet Fountain, Pack of 10 [Compatibility] ONLY Compatible with Petory® 74oz/2.2L Pet Water Fountain. If any doubt, please check product dimensions.[Compatible Pet Filter] Length is about 4.75 inch. Shortest Width is about 1.75 inch. Longest Width is about 2.13 inch. Thickness is about 0.4 inch.[Premium Quality Filters] Double Filtration System: Composed of a cotton layer and activated charcoal. Effectively to filter hair, heavy metals, keeps water fresh and improve the taste of the water.[Frequency Of Replacement] To prevent the activated carbon dust from shedding into water, please soak the cat fountain filter in water for 2 minutes then rinse thoroughly under running water before using. 1 to 2 weeks in summer and 2 to 4 weeks in winter. If multiple cats are using the fountain, more frequent replacement will be necessary.[Premium 12 Pack Pet Fountain Filters] 12-pack of premium pet fountain replacement filters and 6 Pack of pre-filter sponges individually packaged and sealed to maintain high quality. Enough supply for 3 to 12 months of use. Replace the pre-filter sponge every 4-6 weeks.[Friendly Customer Service] Please feel free to contact us if you have any questions about our products, we'd like to help you!