Drinkwell® platinum original 3x replacement filters at a glance 3 active carbon filters drinkwell® recommend that drinking fountain filters should be replaced at least every 4 weeks. Important instructions the device must be cleaned once a week with hot soapy water because cat dog hair and other particles can impair the operation of the drinkwell® fountain by petsafe®. Furthermore, the device and especially the motor pump must be de scaled with vinegar water every 2 4 weeks depending on the water hardness. After cleaning or de scaling, it is important to thoroughly rinse the device. Please also make sure to maintain the water level. The pump should under no circumstances be allowed to dry out. If dried out, the warranty will become null and void.