Compatible with 108oz/3.2L and 67oz/2L Stainless Steel Cat Water Fountain. Also compatible with model PLWF003. Replace the carbon filter every 4 weeks; in hot weather, replace every 2 weeks to prevent bacterial growth. Replace the foam filter every 2 months to maintain fresh water. This set includes 8 filters and 8 sponges for easy replacement and extended protection for your pet. Three-layer filtration system: - First layer: Blocks hair and debris - Middle layer: Reduces residual heavy metals - Third layer: Promotes healthier, high-quality flowing water, ensuring pets drink clean, fresh water all day Before use, soak the filter in clean water for 5 minutes to ensure proper saturation. Do not soak the filter directly in the fountain tank to avoid contamination. The filter must be fully soaked before turning on the fountain; otherwise, water may not flow properly and could cause overflow. Material: Sponge Color: White + Black Package Contents: 8 x filter elements, 8 x filter sponges Note: Only the items listed are included. Other products shown are not part of this package. Lighting and monitor settings may cause slight color variations between the image and the actual product. Measurement may vary by 1-3 cm due to manual checking.