2 Lb. plastic bag of Crystals of Sulfamic Acid Cleaner for removing hard water deposit from swamp / evaporator cooler , Removing dried Portland cement grout haze and mortar residue from tile, concrete, and masonry , descale heat exchange . It is a mild, safe to use, acid based cleaner. Do not use on marble or other polished stone. It is the main active ingredient in Lime away cleaner and similar hard water cleaner..
Have over 100 pounds of it , discount on large quantity .