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 water freshness. This set includes 8 replacement filters and 8 sponges for easy maintenance 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 dry. 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. Additional products shown in images are not included. Lighting and monitor differences may cause slight color variations between the product image and actual item. Measurement tolerance: +/- 1-3 cm.