Wide Compatibility: Designed for 2.5Gal/9.5L large dog water fountains, these 18CM larger cat fountain filters help keep your pet's water clean, fresh, and great-tasting. Ideal for pet owners looking to support a healthy hydration environment for their pets. Triple Filtration System: Replacement filters include high-density cotton to capture hair and debris, plus a coconut activated carbon layer that reduces chlorine, odors, and impurities to improve water taste. This system supports overall pet wellness. Pump Protection: Each filter features a high-density sponge that helps prevent debris and pet hair from entering the pump, contributing to longer pump life and reliable fountain performance. Usage Instructions: For best results, soak the filter in clean water for 2 minutes and rinse thoroughly under running water before use. This helps activate the carbon layer for effective filtration from the first use. Regular Replacement Recommendation: To maintain water quality, replace the filter every 12 days. In multi-pet households, more frequent replacements may be beneficial to support optimal performance. Quantity: 12 Filters and 12 Sponges / 6 Filters and 6 Sponges Color: As shown Material: PP Package Contents: 12 x Cat Water Fountain Filters 12 x Sponge Foam Filters / 6 x Cat Water Fountain Filters 6 x Sponge Foam Filters Package includes only the items listed above; other accessories are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement error is +/- 1-3cm.