On The Go Spotless Portable Dual Bed Deionizer This unit is .50 CUFT compared to two 20" X 4.5" big blue housings (.33 CUFT). Two tanks each weighing only 18 lbs and each measuring 22 X 6.75. The compact space-saver design fits a very small footprint of 8 X 20. The unit will produce approximately 600 gallons before recharging is necessary AT 200 ppm. Produces 210 more gallons than Two 20-inch deionizing resin cartridges. It comes complete with a high-flow shut-off valve, 4 ft. hose, polypropylene cam lever quick between tank set-up and a cap and plug for travel plus a handheld digital TDS meter.