Check the listing for details. PET STANDARD Water Filters For PETLIBRO® BPA-Free Capsule, 12 Pack. Condition: New. Listed at 16.99 USD. [Compatibility] Compatible with PETLIBRO BPA-Free Capsule Pet Water Fountain, 71oz/2.1L. If any doubt, please check product dimensions.[Oval Pet Filter] Length of oval is about 7 inch. Width is about 3.6 inch. Thickness is about 0.4 inch.[Premium Quality Filters] Triple Filtration System: Composed of a cotton layer, activated carbon and an ion exchange resin. 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 5 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, individually packaged and sealed to maintain high quality. Enough supply for 3 to 12 months of use.[Friendly Customer Service] Please feel free to contact us if you have any questions about our products, we'd like to help you!