Here's the ultimate deal! Achieve the lowest cost per gallon and produce the greatest output by selecting this refill kit that contains all new, never before regenerated resins. This option provides one refill that will produce DI water. Comes complete with one 1 cubic foot box of cation premium resin supplied in hydrogen form for stage 1 and two 1 cubic foot boxes of anion premium resin supplied in hydroxide form for stages 2 and 3. The funnel, cap, silicone lubricant, and instructions are also included.