[specification]- our cat fountain filters are available for a variety of pet fountains compatible with 1.6l automatic fountains from youthink/hommii/isyoung/koalad/happypapa/pedy/purepet/commart and plus (Note: not applicable to catit/mospro fountains) Size: 5.1*0.4 inch Each filter consists of a layer of cotton, activated carbon and ion exchange resin. They filter out hair, heavy metals and improve the taste of water, so pets can drink clean, fresh water all day, which helps increase water intake and reduce the risk of urinary tract infection [Improved quantity and quality] Compared to most pet fountain filters available on the market, Cat Fountain Filters from premium quality contain more than 100% coconut charcoal for better purification. Our cat fountain filters have higher adsorption capacity [eco-friendly pet fountain filter] It's a good deal to have these 8 packs and change the filter in 2 - 4 weeks so you can save money while taking care of your pet. However, if more than one cat uses the fountain, more frequent replacement is required. To prevent activated carbon dust from falling into the water (without harming your pet), immerse the filter in water for 2 minutes and rinse it thoroughly with tap water before use. /p> [our after-sales service] please feel free to for refund or replacement if you have any quality issues with our pet fountain filters and we will do our best for you support