By Natural Chemistry



Model # 07395

Alternate Part #'s NAT07395, NC07395EACH

Product Description

Natural Chemistry Extra Strength Stainfree - 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

Dosage: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

Tips: 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

For our complete line of Natural Chemistry Pool & Spa Chemicals

Product Specifications

1.75 lbs.

?     Asked on 12/6/2021by Scott

Can Stain Free be used on stains in a gunite salt pool?

A  Answered on 12/6/2021 by InyoPools Product Specialist Rich N.

Hi Scott, this is ideal for treating staining on all types of pool surfaces, including gunite/plaster in a salt pool.  After using StainFree, you can use MetalFree at the rate of 4 ounces per 10,000 gallons of pool water weekly to deactivate stain-causing metals and prevent staining and water discoloration caused by iron, copper and other trace metals. 

?     Asked on 12/20/2012by Guest

Can I use this if I have metal stains in the pool?

A  Answered on 12/20/2012 by InyoPools Product Specialist Patrick P.

Yes, the Stain Free will help remove metal stains from your swimming pool.

?     Asked on 11/29/2012by Guest

Can the Stainfree be used before I shock the pool?

A  Answered on 11/29/2012 by InyoPools Product Specialist Patrick P.

No, shock should not be added to the pool for one week after the Stainfree is added to the swimming pool. If the chlorine needs to be raised you can use small amounts to increase it. The chlorine level should not exceed 2 ppm.


Est. Repair Time

Less than 1 hr

Tools Needed


Our pool flooded and had red clay stains on our vinyl liner

Written on 6/29/2019 by Guest

Poured solution in pool after lowering chlorine level. Fabulous results

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