The Catit Triple Action Fountain Filters are not designed to cure any disease or illness, however these filters do help remove bacteria and chlorine odors and filter out debris. The filters help soften the minerals like magnesium and calcium in the tap water to help prevent urinary tract diseases. The Catit Triple Action Fountain Filters are suitable for the Catit 2.0 Flower Fountain (43742W) and the Catit Design Cat Drinking Fountain - 3 L/100 fl oz (55600). The filters are available in a pack of 2 (43745) or pack of 5 (43746). For a free reminder to replace the fountain filters, visit catit.com to sign up.