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; during 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 for your pet. Three-layer filtration system: The first layer traps hair and debris, the middle layer removes residual heavy metals, and the third layer ensures healthier, high-quality flowing water, providing pets with clean, fresh water all day. Before use, soak the filter in clean water for 5 minutes to ensure proper saturation. Do not install the filter dry, as this may cause overflow. Avoid soaking the filter directly in the fountain tank to prevent dust contamination. Material: Sponge Color: White + Black Package Contents: 8 x filter elements, 8 x filter sponges Note: Only the items listed are included. Other products are not part of this package. Please note that lighting and monitor settings may cause slight color variations between the image and the actual product. Measurement tolerance is +/- 1-3 cm.