①. Compatible with multiple models: Compatible with our 108oz/3.2L and 67oz/2L Stainless Steel Cat Water Fountain (More compatible models: PLWF003). ②. Replace regularly: Pet water fountain need to replace the carbon filter every 4 weeks (In hot weather, which may breed mosquitoes, please replace the carbon filter once every 2 weeks), and replace the foam filter every two months to help keep the water fresh. ③. Quantity specification: Set of 8 filters and 8 sponges compatible, easy replacement, bringing more protection to your pet. ④. Three-layer filtration: First Filter, Block Hair and Debris; Middle Filter, Remove Residual Heavy Metals; Third Filter, help provide flowing water, allowing pets to drink clean, fresh water throughout the day. ⑤. 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. ⑥. Material: sponge; colour: white + black. ⑦. Package Contents: 8 * filter elements; 8 * filter sponges. Only the above package content, other products are not included. ⑧. Note: Light and different displays may cause the color of the item in the picture to be a little different from the real thing. The measurement allowed error is +/- 1-3cm.