Usage Tips:PACKAGE INCLUDES: The package comes with 24 packs of cat fountain filter replacement and 24 sponges. They are individually wrapped and sealed for your daily storage and use. Depending on how often your pet drinks and how many pets you have, we recommend that you clean your pet fountain filter once a week and change it 1 to 2 times a month to keep the water fresh and clean.PERFECT MATCH: The cat fountain filter measures 2.99 x 1.69 inches and the sponge measures 3.1 x 1.1 inches, which is compatible with most 67oz/2L, 101oz/3L, 108oz/3.2L and 135oz/4.0L stainless steel pet fountains on the market. Please confirm whether it is compatible with your cat fountain before purchasing!EASY TO USE: This pet fountain filter replacement is very easy to install and remove, which save your time and engegy! Please soak the pet water fountain filter and sponge in water for at least 3 minutes to stimulate optimal filtration and rinse them thoroughly under running water. It will helps to keep the cat water fresh for longer use.TRIPLE FILTRATION SYSTEM: The filters for cat water fountain are made with activated carbon, ion exchange resin and non-woven fabric, which form a triple filtration system. They can help to filter out impurities such as hair, food residue, absorbs odors, and softens the water while improving the taste of the water, helping to keep your pet healthy.RELIABLE MATERIALS AND SERVICE: The cat fountain filter replacement is made of -free materials, they will not affect your pet's health, which bring you peace of mind. We value your satisfaction with our products and are committed to providing you with excellent customer service.Colour:White & BlackMaterial:Cotton clothPackage Contents:24 * Filters24 * SpongesOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.