Compatible with 108oz/3.2L and 67oz/2L stainless steel cat water fountains. Additional compatible model: PLWF003. Replace the carbon filter every 4 weeks; in 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 extended 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 Helps pets drink clean, fresh water throughout the 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. Failure to do so may result in improper water flow or overflow. Do not soak the filter directly in the fountain tank to avoid dust dispersion. Material: Sponge Color: White + black Package contents: 8 x carbon filter elements, 8 x filter sponges Note: This package includes only the items listed. Other products are not included. Lighting and display settings may cause slight color variations between the image and the actual product. Measurement may vary by +/- 1-3 cm.