This is a set of 6 boxes (12 months' worth) of GEX Catit Flower Fountain Water Softening Filter Mini. These are the dedicated filters for the Mini. ● For maintaining lower urinary tract health! ● The ionic (ion exchange resin) removes magnesium and calcium, making the water gentle (soft water) 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.