The Catit Mini Triple Action Fountain Filter helps cats feel their best by ensuring only the cleanest water is available. The filter helps removes minerals like magnesium and calcium from tap water that can accumulate in your cat's lower urinary tract and cause illnesses like urinary tract disease. With 3 different components for clean water, the filter 1. Removes odours caused by bacteria and chlorine. 2. Softens tap water. 3. Filters out hair, sediments, and debris. Removes odours caused by bacteria and chlorine which cats are sensitive to Softens tap water to help prevent urinary tract infections, which is a common health issue for cats Filters out hair, sediment, and debris, so water is always fresh 1 Filter cartridge lasts for up to a month Compatible With: Catit Mini Flower Fountain Available Size: 3-Pack