Make cats to drink more water: Fller for our alternative cat fountain can smooth the drinking water water to ensure that the drinking water is healthy and clean, let the cats fall in love with drinking water, and reduce the chance of infection of your pet with urinary tract diseases. Triple filtration: Our alternative filter is made of high -quality high -quality cotton, active carbon and ion exchange. Double layers can filter hair and debris; A activated carbon with a coconut shell can remove microorganisms and soften water; Eye exchange can filter heavy metals and improve water quality. Packing and size: Our product contains 10 filters, each filter packed individually and closed. The outer diameter per filter is about 12.7 cm (5 inches), the internal diameter 4 cm (1.57 inches). Please make sure that your water fountain match our filter before buying. How to use: Please rinse the filter with running water before using it for the first time, then install it in the water fountain. To ensure clean and refreshing water quality, we recommend that the filter be replaced every 2-4 weeks. Adaptation form: Our filter is compatible with most 1.6 -liter, 2.0 -liter and 2.4 -liter drinking fountains. Please note that it is not compatible with 3.0 -liter drinking fountains. Please check the size before buying to avoid unnecessary waste.