Compatible with 108oz/3.2L and 67oz/2L stainless steel cat water fountains. 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, clean water. This set includes 8 carbon filters and 8 foam sponges for easy replacement and extended 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 Helps ensure pets drink clean, fresh water daily. Before use, soak each filter in a clean bowl of water for 5 minutes. Do not soak filters in the fountain tank. Ensure the filter is fully saturated before turning on the fountain to prevent overflow. Material: Sponge Color: White + Black Package Contents: 8 x filter elements, 8 x filter sponges Note: Only the items listed are included. Light and display differences may cause slight color variations. Measurement error allowed: +/- 1-3 cm.