Compatible with 108oz/3.2L and 67oz/2L Stainless Steel Cat Water Fountain. Additional compatible models include PLWF003. Replace the carbon filter every 4 weeks; during hot weather, replace every 2 weeks to maintain water quality. Replace the foam filter every 2 months to ensure 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 for clean, fresh drinking water all day Before use, soak the filter in a clean bowl of water for 5 minutes. Ensure the filter is fully saturated before turning on the fountain. Do not soak the filter in the fountain tank to prevent 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 differences may cause slight color variations between the image and actual item. Measurement error allowed within +/- 1-3 cm.