Premium Platium Charcoal Water Filter Replacement for Drinkwell Pet Fountain - 12 Filters ACTIVATED CHARCOAL PREMIUIM 12 PACK : 12 Packs premium charcoal water filter replace drinkwell water filters from PureGreen made from coconut shells Fit models: Compatible with Drinkwell Original, Drinkwell Platinium, Drinkwell Big Dog, Drinkwell Multi-Tier, Drinkwell Outdoor Dog, Drinkwell Mini, Drinkwell Zen KEEP YOUR DOG HEALTHY : Suggested to replace filters every 2-4 weeks to keep the water clean in your pets Drinkwell fountain tasting fresh Individual polybagged and sealed to maintain the high quality Food grade activated charcoal. Quality meet or exceed leading national brands.