Compatible with Drinkwell Lotus Avalon and Pagoda pet water fountains. Extends the life and flow rate of the filter pump. Provides your pet with cleaner, healthier water. Please replace the foam pre-filter and carbon filter every 2 to 4 weeks depending on use. "The replacement cat fountain filter that can be used with PetSafe Drinkwell Avalon Pagoda Seascape Sedona." This replacement cat fountain filter is not sold or created by Petsafe Drinkwell Avalon Pagoda Seascape Sedona. For any reason, you are not completely satisfied with these filters.