Compatibility: Cat Fountain Replacement Carbon Filters are compatible with 1/2 Gallon, 1 Gallon, 2 Gallon, Butterfly, Avalon, Pagoda, Seascape, Sedona, Seaside, and Creekside Pet Fountains. Three-layer Filtration: This replacement filter features a cotton layer and activated carbon. It effectively removes hair, debris, odors, and other impurities to keep water fresh and clean. Pre-filter Sponges: The sponge helps prevent debris from clogging the pump, helping extend the pump's lifespan. Filter Replacement: Soak the filter in water for 5 minutes before first use and rinse thoroughly under running water. Replace the cat water fountain filter every 4 weeks in summer and every 46 weeks in winter to maintain clean drinking water. Replace more frequently if multiple pets use the fountain. Comprehensive filtration helps improve water quality for your pets health and satisfaction. Multi-Filtration System: Includes a cotton layer and activated carbon. The cotton layer traps hair and debris; activated carbon reduces odors and keeps water clean and palatable. Color: As shown in photo Material: Non-woven fabric Package Options: Option A: 6 pcs Package Contents: 6 x Water Fountain Filters 6 x Replacement Foam Option B: 8 pcs Package Contents: 8 x Water Fountain Filters 8 x Replacement Foam Package includes only the items listed above; other products are not included. Note: Due to light reflection and differences in display screens, the color in the image may vary slightly from the actual item. Measurement error is permitted within +/- 13 cm.