Natural Chemistry Stain Free Extra Strength is ideal for treating staining on all pool surfaces. This natural stain remover contains a blend of industrial strength ascorbic acid to quickly remove metal staining without adding phosphates to your water. It is compatible with all sanitizing systems, non-toxic, and environmentally friendly. Use with Natural Chemistry Metal Free for the ultimate 1-2 combination for stain fighting.
1.75 lb per 20,000 gallons of water.