Compatible with 108oz/3.2L and 67oz/2L Stainless Steel Cat Water Fountain models (including 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 continuous pet protection. Features a three-layer filtration system: the first layer traps hair and debris, the middle layer reduces residual heavy metals, and the third layer ensures healthier, high-quality flowing water for pets to drink clean water all day. Before use, soak each filter in clean water for 5 minutes to ensure proper saturation. Do not soak filters directly in the fountain tank to avoid dust contamination. Material: sponge. Color: white + black. Package contents: 8 x filter elements, 8 x filter sponges. Note: Other items not included. Due to lighting and monitor differences, the actual color may vary slightly from the image. Size tolerance: 1-3 cm.