Charcoal Water Filter Replacements for Petsafe Drinkwell 360 Pet Water Fountain By NISPIRA, 6 Filters 6 premium charcoal water filters by NISPIRA replace drinkwell 360 water filters Fit models: Drinkwell 360 Suggest replacing filters every 2 to 4 weeks to keep the water clean and fresh Food graded activated charcoal. Quality meet or exceed leading national brands. Solely distributed by Coffee and Toy