Triangle filter element pet water dispenser filter element filter bag filter cotton replacement filter [Multi-Filtration Filter] The food-grade cat water dispenser filter features a 5-layer filtration system. High-density cotton filters out particles and debris; activated carbon absorbs odors and impurities, purifying and preserving water to reduce the risk of urinary tract infections and kidney problems. [High-density Bag and Sponge] The filter bag removes hair and large impurities to enhance filtration; the high-density sponge prevents debris from entering the pump, extending its lifespan. [Warm Reminder] Before replacing the filter element, soak it in clean water for 2 minutes and then rinse it thoroughly to prevent carbon dust from falling into the water and keep the water clean. [Regular Replacement] To maintain filtration effectiveness, you need to replace the filter, mesh bag, and sponge every 7-12 days; if you have multiple pets, please replace the filter and clean the dispenser more frequently.