1. RICH CAT FOUNTAIN FILTER SET: Includes 16 cat fountain filters 8 sponges. Dimensions: 7 cm x 4.5 cm 2.8 cm x 1 cm, compatible with 3.2L stainless steel cat fountains and 2L adjustable flow pet fountains. Each cat fountain filter is individually packaged to ensure airtight sealing. 2. Multi stage Filtration: The cat fountain filter utilizes non woven fabric, activated carbon, and natural resin to remove fine impurities and loose hair. It filters out dusty air particles to enhance water purity and taste, while the outer cotton layer of each filter absorbs dirt, providing clean water for your cat. 3. Promotes Pet Health: Prolonged consumption of water with metal ion content may lead to reduced water intake or urinary stones in pets. The cat fountain filter improves and softens water, helping prevent urinary tract diseases. It encourages pets to drink more water, supporting their overall well being. 4. Easy to Use: Soak the cat fountain filter in water for 2 minutes before use, then rinse thoroughly under running water. Insert the filter into the designated slot in the fountain and lightly press the closing flap to ensure filtration, keeping your pet's water fresh throughout the day.