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 keep water fresh. 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 Ensures pets have access to clean, fresh water daily. Before use, soak the filter in a clean bowl of water for 5 minutes. The filter must be fully soaked prior to turning on the fountain; otherwise, water may not flow properly through the filter, which could cause overflow. Do not soak the filter directly in the fountain tank to avoid introducing dust into the water. Material: Sponge Color: White + Black Package Contents: 8 x Carbon Filters, 8 x Filter Sponges Note: This package includes only the items listed above. Other products are not included. Lighting and display settings may cause slight variations in the color of the item shown in the image compared to the actual product. Measurement may vary by up to +/- 1-3 cm.