Compatibility Notes - It is perfectly compatible with Neverland Square 2L Cat Water Fountain and Round Stainless Steel Cat Fountain. Please make sure the size of these filters is compatible with your fountain before purchase. 6 Piece Individual Package - This product contains 6 pieces of filters, each piece of filter is individually packaged, which effectively guarantees the tightness of each filter part. Triple filtration system - Consisting of a layer of high-quality cotton, activated carbon and heat exchanger resin. ;ions. Effectively filter hair, heavy metals, impurities, keep water fresh and clean all the time. Protect pets’ health - Provide clean and fresh water to your pet and help reduce the risk of urinary tract infection; it is very important for the health of pets. Suggestion - Soak the filter for 5 minutes before use. To maintain the filtering effect, it is recommended to replace the filter every 2-4 weeks.