Compatible with 108oz/3.2L and 67oz/2L stainless steel cat water fountains. 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 carbon filters and 8 foam sponges for easy replacement and continuous 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 Ensures pets drink clean, fresh water all day long. Before use, soak each filter in a clean bowl of water for 5 minutes. The filter must be fully soaked before turning on the fountain; otherwise, water may not flow properly and could cause overflow. Do not soak the filter directly in the fountain tank to avoid dust contamination. Material: Sponge Color: White + Black Package Contents: 8 x filter elements, 8 x filter sponges Note: Only the items listed are included. Other products are not part of this package. Lighting and monitor differences may cause slight color variations between the image and actual product. Measurement error allowance: +/- 1-3 cm.