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; during 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 carbon filters and 8 foam sponges for easy replacement and continuous 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 Ensures pets drink clean, fresh water daily. Before use, soak the filter in clean 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 Carbon Filters, 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 the actual product. Measurement error allowed within +/- 1-3 cm.