Pro Citric Acid or known as Ban-T comes in a 4 lbs. container. Used to clean calcium, lime and scale deposits. Pro Ban T is a water softener iron removal cleaner that is specially formulated to effectively lower pH and remove iron and other contaminants from fouled water softeners. The water softener iron removal cleaning powers of Ban T should be used as preventative maintenance on all water softeners in areas with moderate iron content to maintain the life of the softener. Ban T is an environmentally friendly water softener iron removal cleaning agent that removes hard water deposits, lime scale and moderate iron staining from household fixtures. Effectively lowers the pH of your water Will remove iron, tannins and other build-up from water softeners AND backwashing filters Increases capacity of the softener unit and backwashing filter Removes hard water deposits on household items Non-toxic, non-corrosive, and non-hazardous. Safely use on many surfaces.