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 have access to clean, fresh water daily. Before use, soak the filter in clean water for 5 minutes to ensure proper saturation. Do not install the filter dry, as this may cause overflow. Avoid soaking the filter directly in the fountain tank to prevent dust contamination. Material: Sponge Color: White and black Package contents: 8 x filter elements, 8 x filter sponges Note: This package includes only the items listed. Other products are not included. Due to lighting and display differences, the actual product color may vary slightly from the image. Measurement error allowance: +/- 1-3 cm.