Compatible with 108oz/3.2L and 67oz/2L stainless steel cat water fountains. Additional compatible models include: PLWF003. Replace the carbon filter every 4 weeks; during hot weather, replace every 2 weeks to maintain water freshness and prevent contamination. Replace the foam filter every 2 months for optimal performance. This set includes 8 replacement carbon filters and 8 foam sponges for easy maintenance and continuous protection. Three-layer filtration system: The first layer traps hair and debris; the middle layer reduces residual heavy metals; the third layer ensures healthier, high-quality flowing water, providing pets with clean and fresh water all day. Before use, soak each filter in a clean bowl of water for at least 5 minutes to ensure full saturation. Do not install the filter dry, as this may cause improper water flow or overflow. Avoid soaking the filter directly in the fountain tank to prevent dust dispersion. Material: Sponge Color: White + Black Package Contents: 8 x Filter Elements, 8 x Filter Sponges Note: This package includes only the items listed above. Other products are not included. Lighting and monitor settings may cause slight color variations between the image and the actual product. Size measurements may vary by +/- 1-3 cm due to manual measurement.