ERFEcT FITcompatible with our 67oz2L & 101oz3L PETLIBRO Stainless Steel cat Water Fountain MODEL: PLWF003PLWF006 Tipslease buy ture PETLIBRO filters to ensure the filtering effect pirated filters may cause harm to your pets health KEEP YOUR PET HEALTHYThe improved filter is composed of a cotton layer activated carbon and an ion exchange resin It can effectively remove hair heavy metals and improve the taste of the water so that pets can drink clean and fresh water all day which helps to increase water consumption and reduce the risk of urinary tract infections REcOMMENDATIONSTo prevent the activated carbon dust (which will not harm your pets) from shedding into water please soak the filter in water for 5 minutes and rinse it thoroughly under running water for 30 seconds before use According to your pets drinking frequency and the number of pets using the fountain change the filter every 2 weeks Use time4 Months Set of Replacement Filters (8 packs)