[Triple Filtration Filter] The water filter replacement has a multi-layer filtration system, high-density non-woven fabric captures pet hair and impurities, keeping the water clean; activated carbon removes residual chlorine and odor, purifying water quality; ion exchange resin removes heavy metals ions, soften water quality and improve taste. [Pre-Filter Sponge] The high-density pre-filter sponge can further filter hair and debris and prevent clogging and damage to the pump, extending the life of the fountain pump. [Warm Tips] Before replacing the filter element, please soak the filter element in clean water for 5 minutes, and then rinse the filter element with running water. This can prevent carbon dust from falling off into the water and keep the water clean. Regular ReplacementTo maintain the filtration effect, it is recommended to replace the filter and sponge every 2-4 weeks; if you have multiple pets, please replace the filter and clean the fountain more frequently. Color: white + black Material: non-woven fabric Package list: 4 replacement filters; 4 x sponges