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 catdog 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 w