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Home > Chemicals > Natural Chemistry > Metal & Scale Control
Natural Chemistry Extra Strength Stainfree 1.75lb
Natural Chemistry Extra Strength Stainfree 1.75lb
Part #: 07395

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Vitamin C For Your Pool!

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


1lb per 10,000 gallons (38,000L)

How to Apply:

1. Balance pool water

2. Lower chlorine level to at least 1ppm

3. Add 1lb of Extra Strength StainFree per 10,000 gallons around the perimeter of the pool with the pump running

4. Brush pool thoroughly. After brushing, if stains are not completely removed add more StrainFree Extra Strength

5. Add a pulp based filter aid to your cartridge or sand filter. If you have a DE filter, make sure it is properly charged

6. Add METALfree at a rate of 33.9oz (1L) per 20,000 gallons (75,000L)

7. Vacuum pool slowly and thoroughly

8. After 24 hours clean filter

- Sand filters: backwash for at least 3 minutes and then rinse for 2 minutes

- Cartridge filters: clean filter and filter tank thoroughly

- DE filters: backwash and recharge with DE

9. Use METALfree as a weekly maintenance product to guarantee a stain free pool


A non-polymer filter aid must be used in sand filters with this product

Do not add any chlorine or shock treatment until the pool surface has been thoroughly vacuumed and filter cleaned

DE and cartridge elements should be removed and cleaned, sand filters backwashed

Features & Benefits:

  • Ideal for treating staining on all pool surfaces
  • Not a harsh acid
  • Concentrated formula, works instantly