Great for fiberglass pools with metal staining (grey or discolored patches). This stuff works in seconds however it will alter the Ph and Chlorine levels which is to be expected.
Natural Chemistry Extra Strength STAINFree
Natural Chemistry Extra Strength STAINFree is an all-natural stain remover that contains a blend of industrial strength ascorbic acid. It quickly removes metal staining without adding phosphates to your water!
- All natural stain eliminator
- Tough on old set-in stains
- Compatible with all sanitizing systems
- Non-toxic and environmentally friendly
- Phosphate free