The unit is made up of dual tanks using two difference premium resin products. The first tank in the series contains ¼ cubic feet of cation resin and the second tank contains ¼ cubic feet of anion resin. When running these tanks in series you produce approximately 2 ½ times more water and will reduce your operating cost by 50% compared to the single tank mixed bed deionizer. The dual tank will save you money and give you a great return on your investment. The dual tank model comes with all the necessary fittings including a polypropylene cam lever for easy hook-up and only needs a 10" by 20" compact area. Unit weighs a mere 36 pounds. Unit comes complete with the deionizers, 4' high pressure hose, hand-held TDS meter, shut-off valve, and a cap/plug for the inlet/outlet.