[Compatible with multiple models] Compatible with our 108oz/3.2L and 67oz/2L Stainless Steel Cat Water Fountain (More compatible models: PLWF003) [Replace Regularly] Pet water fountain needs to replace the carbon filter every 4 weeks. (The hot weather breeds mosquitoes, please replace the carbon filter once every 2 weeks), and replace the foam filter every two months to keep the water fresh. [Quantity specification] Set of 8 filters and 8 sponges compatible, easy replacement, bringing more protection to your pet. [Three-layer filtration] First Filter, Block Hair and Debris, Middle Filter, Remove Residual Heavy Metals, Third Filter, Healthier, High-quality Flowing Water, Allow pets to drink clean, fresh water throughout the day. [Matters needing attention] Soak the filter in a clean bowl for 5 minutes Notes, The filter must be fully soaked before the fountain is turned on; Otherwise, the water may not diffuse through the filter and cause overflow. Do not soak the filter in the fountain tank to avoid dust on the surface. Material: sponge Color: white + black Package Contents: 8 * filter elements 8 * filter sponges Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.