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. Replace the foam filter every 2 months to maintain fresh water. This set includes 8 filters and 8 sponges for easy replacement and enhanced pet protection. Three-layer filtration system: - First layer: Blocks hair and debris - Middle layer: Reduces residual heavy metals - Third layer: Promotes healthier, high-quality flowing water for clean, fresh drinking water all day Before use, soak the filter in a clean bowl for 5 minutes. Ensure the filter is fully soaked before turning on the fountain; otherwise, water may not flow properly and 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: This package includes only the items listed. Other products are not included. Lighting and monitor settings may cause slight color variations between the image and actual product. Measurement may vary by +/- 1-3 cm.