PERFECT MATCH: ONLY Compatible with 67oz/2L uahpet Cat Water Fountain. PREMIUM 6 PACK: Package includes 6-pack of premium pet fountain replacement filters and a 12-pack replacement filter Sponges. They are individually packaged and sealed to maintain high quality. FRESH, FILTERED WATER: Each filter is composed of Eco-Friendly Shell, KDF, Ion Exchange Resin, Quartz Sand, Coconut Activated Charcoal and Cotton. They can filter hair, heavy metals, and improve the taste of the water so that pets can drink clean and fresh water all day, which helps to increase water consumption and reduce the risk of urinary tract infections. RECOMMENDATIONS: To prevent the coconut activated charcoal dust (which will not harm your pets) from shedding into the water, please soak the filter and the sponge in water for 15-20 minutes and rinse it thoroughly under running water before use. EASY TO REPLACE: Easily removes when you clean your pets fountain. According to your pet's drinking frequency and the number of pets using the fountain, please replace the filter and the sponge every 3-4 weeks to properly maintain your pet fountain.