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11th June 2020


If scale build up in hot tubs is present in the spa circulation system it can cause a reduction in flow and heater efficiency.

Unbalanced water can be due to high pH and/or high total alkalinity.  Under certain conditions carbonates will deposit on spa surfaces and in the circulation system as scale.

It is essential that the spa water is tested on a regular basis and the recommended key parameters are maintained. For pH this is 7.2 – 7.6 and total alkalinity is 80 – 150mg/l (ppm).

Ensure prompt action is taken to make the necessary corrections in order to prevent the water going out of balance.

Actions to be Taken:

To lower the total alkalinity

  • If pH and total alkalinity both need correction, treat the total alkalinity first.
  • Carry out a total alkalinity test and if the reading is above 150mg/l (ppm), the level will need to be lowered.
  • To lower the total alkalinity, dose with pH & Alkalinity Reducer at the recommended dose rate.
  • Repeat as necessary on a daily basis until the total alkalinity is below 150mg/l (ppm).
  • With the circulation running, pour in a small area of the spa.
  • Re-test the water after 24 hours and if the total alkalinity is still high, repeat.
To lower the pH
  • To lower the pH, dose pH & Alkalinity Reducer at the recommended rate.
  • With the circulation running, distribute around the water. Do not dose it in one spot otherwise some alkalinity may be destroyed.
  • Re-test the water after 24 hours and if the pH is still high, repeat the dose.

To remove scale

Scale on the spa surrounds and surfaces above the water line may be removed with ScaleAway.

1.Shake bottle before use

2.Apply product directly to the spa water whilst the spa pump(s) are turned ‘on’ to aid distribution.

3. Spas treated for heavy scale build-up may require cartridges to be cleaned after treatment.