PACKAGE INCLUDES: The package includes 24 packs of cat fountain filter replacements and 24 sponges. Each filter and sponge is individually wrapped and sealed for convenient storage and daily use. Depending on your pet's water consumption and the number of pets, we recommend cleaning the pet fountain filter once a week and replacing it every 1 to 2 months to maintain fresh and clean water.PERFECT MATCH: The cat fountain filter measures 2.99 x 1.69 inches, and the sponge measures 3.1 x 1.1 inches. This size is compatible with most 67oz/2L, 101oz/3L, 108oz/3.2L, and 135oz/4.0L stainless steel pet fountains available on the market. Please verify compatibility with your specific pet fountain before purchasing.EASY TO USE: These pet fountain filter replacements are easy to install and remove, saving you time and effort. Soak the filter and sponge in water for at least 3 minutes to activate optimal filtration performance, then rinse thoroughly under running water. This helps extend the freshness of your cat's drinking water.TRIPLE FILTRATION SYSTEM: The cat water fountain filters are constructed with activated carbon, ion exchange resin, and non-woven fabric, creating a triple filtration system. This combination effectively removes impurities such as pet hair, food particles, and debris, reduces odors, softens water, and improves overall water taste and quality to support your pet's health.RELIABLE MATERIALS AND SERVICE: Made from safe, non-toxic materials, these filter replacements are designed to be safe for pets and will not compromise your pets health. We are committed to customer satisfaction and provide reliable support for our products.Color: White & Black Material: Cotton cloth Package Contents: 24 x Filters 24 x Sponges Note: Light reflection and differences in display screens may cause slight variations between the color of the item in the photo and the actual product. Measurement errors of +/- 1-3 cm may occur. Only the items listed above are included; other accessories are not included.