By Natural Chemistry



Model # 07511

Alternate Part #'s NAT07511, NC07511EACH, NCH17511NCM

Product Description

Natural Chemistry Scale Free 2 Liter - Stain and Scale Prevention

Scale Free prevents scaling caused by calcium and mineral hardness. It prevents metal staining and scale build-up to prolong pool equipment life as well as preserving pool liners and finishes.


  • Deactivates iron, calcium and other minerals
  • Highly concentrated, phosphate-free formula
  • Compatible with all sanitizers and pool surfaces
  • Will not add phosphates or acid to pool water


  • 32oz (1L) per 10,000 gallons (38,000L)
  • 64oz (2L) per 20,000 gallons (75,000L)

Monthly Dose

  • 5oz (148mL) per 10,000 gallons (38,000L)
  • 10oz (295mL) per 20,000 gallons (75,000L)

How to Apply:

  1. Following dosage chart, add recommended ?initial dosage? of ScaleFree directly to pool water
  2. If water hardness level is above 500ppm, double the recommended dose


  • ScaleFree may aid in the removal pre-existing scale along with thorough brushing

Features & Benefits:

  • Protects your pool from the damaging effects of scale build-up and staining due to excessive calcium, iron, copper and other minerals
  • It works without the use of phosphates or harsh acids
  • Helps prevent scale from forming on salt generator cells to help maintain optimum performance
  • Can be used with any sanitizing system and is compatible with all pool surfaces

For our complete line of Natural Chemistry Pool & Spa Chemicals

Product Specifications

2 L

?     Asked on 1/19/2012by Guest

Is constant use of calcium hypochlorite shock(cal-hypo) bad?

A  Answered on 1/19/2012 by InyoPools Product Specialist Patrick P.

Constant use of cal-hypo can lead to high levels of calcium which could result in cloudy water or scale build up inside the pump and filter as well as the surface of the pool.

?     Asked on 2/22/2012by Guest

What is the liquid color of this pool chemical?

A  Answered on 2/22/2012 by InyoPools Product Specialist Patrick P.

This chemical is mostly clear, but does have a hue of light tan.

?     Asked on 7/2/2015by Eileen Larue

We have a fiberglass pool and a salt system...our pool has a white coating wherever the water is...we don't know if it is from the salt or what...how can we get rid of it? Would scale free help us...and, would it be safe for the fiberglass?

A  Answered on 7/5/2015 by InyoPools Product Specialist Lennox H.

Hi Eileen, The Natural Chemistry Scale Free 2L is safe for fiberglass pools and will work on removing scale from your pool surface. It will be a slow process but will work. Then you can use it as a monthly application to prevent scale from forming,

?     Asked on 5/14/2016by Inyo Visitor

what is the difference between scale free,and stain and scale made by natural chemistry

A  Answered on 5/16/2016 by InyoPools Product Specialist Lennox H.

Hi, The Scale Free and the Stain & Scale do the same thing but the Stain & Scale is more so for the commercial pool industry is more potent than the Scale Free.


Est. Repair Time

Less than 1 hr

Tools Needed

Scale Free

2     0

We have incredibly hard water in AZ and scale was causing the walls of the pool to be whitish.

Written on 9/26/2019 by Guest

We drained the pool and scrubbed the walls with muriatic acid. It looked much better. Now I use Scale Free every month as directed for the size of my pool. It has maintained it so much better than previously and allows the beautiful blue color to come through.

Were these instructions helpful? 


Review Summary

 (Average 4.86  out of 5 stars)
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