United 718 Professional Multi-Purpose Industrial Descaler puts the cleaning power of oxygen in your hands. Use it to clean and remove scale caused by lime, calcium, hard water and more. It can even remove rust stains. It is bleach-free, acid-free and dye-free. Yet, full of the cleaning power provided by peroxide and added oxygen that penetrates to break through scale and dirt build-up.  When you don't want an acid-based product, but need a low-pH to get the job done. turn to OXY PRO.