5 litres of Aquaclear Iron Stain Remover.
Iron Stain Remover is a blend of organic acids formulated for cleaning and brightening of surface areas. The solution will effectively remove surface Iron stains or deposits, vegetation stains, soot and soil deposits. Iron Stain Remover is also an excellent cleaner of Iron water stains from concrete, brick, and terrazzo. Iron Stain Remover can also be used to lighten old concrete surfaces that appear dull or contaminated.