Profile: Carolina Water Systems Supply, Inc. specializes in offering water softeners and water conditioners. We also offer portable exchange deionized water tanks, reverse osmosis, filter & filtration units and ultraviolet lights. Our carbon filters help to remove chlorine from water. Most often filters are added after a water softener or other type of a water system to maximize effectiveness. Water softeners & conditioners work by filtering water through a resin bed. The resin releases the softer salt particles in order to attract the heavier metals like magnesium and iron.