Natural Chemistry STAIN FREE 1.75 Lbs - 07400



Model # 07400

By Natural Chemistry

  5 Average  



Model # 07400

Product Description

Natural Chemistry Stain Free 1.75lbs. - All Natural Stain Eliminator!

Stain Free is an all-natural stain remover that contains a blend of industrial strength citric acid. Quickly removes metal staining without adding unwanted phosphates to your pool water.


  • Less expensive alternative to ascorbic acid
  • Ideal for all surfaces
  • Non-toxic and will not harm the environment
  • Compatible with all sanitizers and pool surfaces
  • Phosphate-free formula


  • 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

For our complete line of Natural Chemistry Pool & Spa Chemicals

Product Specifications

1.75 lbs.

?     Asked on 6/21/2017 by

we are adding a filter aid with Metal Free this evening. do we vacuum tonight? instructions just say add the two products and vacuum, no details about timeline. thanks!

A  Answered on 8/5/2017 by InyoPools Product Specialist Alex V.

I would recommend adding the product and letting the filter run for at least a few hours. After that, you can turn off the pump overnight to allow the particles to settle to the pool floor and vacuum the following day. 

?     Asked on 12/29/2016 by tom

Can pristine stain free be used to effectively remove extreme calcium buildup in my pool?????

A  Answered on 12/29/2016 by InyoPools Product Specialist Adam Y.

Good morning Tom, Unfortunately, This product is formulated to remove metallic stains. This will not remove calcium stains.

?     Asked on 9/21/2016 by

Can stain free be put in the pool anytime of day?

A  Answered on 9/22/2016 by InyoPools Product Specialist Stacey M.

Hello, yes you can use it anytime of day, please make sure to check your chlorine level and follow instructions for product under product description.

?     Asked on 6/23/2016 by Judith O'Baker

After using this the stains were gone in 24 hours but the next 12 hours the pool has turned cloudy. I went to get my water checked and I use pristine blue and my blue levels were too high, everything else tested great. I cannot shock it for a week - that is the only thing the pool company suggested. what else can I do. I keep vaccuuming and backwashing.

A  Answered on 6/29/2016 by InyoPools Product Specialist Lennox H.

Hi Judith, The pool is cloudy because of the low chlorine level, you can slowly start adding chlorine to the pool.

?     Asked on 12/20/2012 by 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 11/29/2012 by 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.


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