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. Triple Filtration System: Replacement filters feature high-density cotton to capture hair and debris, with a coconut shell activated carbon layer that reduces chlorine, odors, and impurities to improve taste. This system supports overall urinary and kidney health in pets. Pump Protection: Each filter includes a high-density sponge that helps prevent debris and pet hair from entering the pump, promoting longer pump life and reliable fountain operation. Usage Instructions: For best results, soak the filter in clean water for 2 minutes and rinse thoroughly under running water before use. This step activates the carbon layer for effective filtration from the first use. Regular Replacement Recommendation: Replace the filter every 12 days for optimal performance. In homes with multiple pets, more frequent replacement may be needed to maintain water quality and fountain efficiency. 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 Sponges / 6 x Cat Water Fountain Filters, 6 x Sponges (Foam Filters only – other items not included) Note: Lighting and monitor settings may cause slight color variations between the image and actual product. Measurement may vary by +/- 1-3 cm.