Brand new Drinkwell Platinum 12 (4 - 3 packs) Pet Filters feature a 6 compartment plastic frame which allows for an even distribution of the charcoal throughout the filter, maximizing filtration with every use. Filters should be changes every 4-8 weeks depending on the size and number of pets using the fountain. Twelve filters should be a 2 year supply. The Drinkwell Platinum Pet Filters are Name Brand and new in full retail packaging (Not Private Label).