Perfect Compatibility: Designed specifically for the 410oz/3.2Gal/12L WF120 large stainless steel pet water fountain, this set of replacement filters and pump sponges ensures a perfect fit and optimal functioning of your pet's hydration station. Advanced 4-Layer Filtration System: Each filter features a sophisticated 4-layer design comprising high-density cotton, coconut shell activated carbon, and ion exchange resin. This system effectively removes particles, hairs, debris, and heavy metals, providing your pets with clean, pure water. Protective Pre-Filter Pump Sponges: The included high-density sponges serve as a pre-filter, capturing impurities and hairs before they reach the pump. This not only keeps the water cleaner but also extends the lifespan of the pump by preventing clogging. Recommended Replacement Schedule: To maintain optimal water purity, it is advised to replace the filters and sponges every 2 to 4 weeks. Installation Tips: For best results, soak the filter in clean water for 5 minutes before installation. Rinse thoroughly to remove any carbon dust. This pre-use preparation helps prevent carbon dust from shedding into your pet's water. Quantity:12PCS/24PCS Color:As Shown Material:Non-woven fabric Package Contents: 6 * Cat Water Fountain Filters 6 * Sponges Foam Filters / 12 * Cat Water Fountain Filters 12 * Sponges Foam Filters Only 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.