The Marlo MRG Series Industrial Water Softening System is a corrosion-resistant alternative to the MR Series for industrial or large commercial water softening applications. These softeners are equipped with FRP resin tanks and Sch 80 PVC exterior piping and valves. All ‘MRG’ systems are factory skid mounted, pre-piped, and pre-wired. Standard designs are available for twin and triple tank configurations.