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 extended protection. Three-layer filtration system: - First layer: Blocks hair and debris - Middle layer: Removes 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 and black Package Contents: 8 x Filter elements, 8 x Filter sponges Note: This package includes only the listed items. Other products are not included. Lighting and monitor settings may cause slight color variations between the image and the actual product. Measurement tolerance: +/- 1-3 cm.