This is a set of 3 GEX Catit Flower Fountain Water Softening Filter Minis (3 months' worth). One filter does not have a box. ● For maintaining lower urinary tract health! ● The ionic (ion exchange resin) removes magnesium and calcium, making the water gentle (softened) for cats! ● Contains antibacterial activated carbon to suppress the growth of bacteria and absorb chlorine odors. ● The non-woven fabric layer removes food particles, hair, and dust. #GEX #PetSupplies