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 carbon filters and 8 foam sponges for easy replacement and continuous 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 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. Avoid soaking directly in the fountain tank to prevent dust contamination. Material: Sponge Color: White + Black Package Contents: 8 x Carbon Filters, 8 x Foam Sponges Note: This package includes only the items listed. Other accessories are not included. Lighting and monitor settings may cause slight color variations between the image and the actual product. Measurement tolerance: 1-3 cm.