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How to avoid white sediment/limescale ?

What is the white sediment ?

The white sediment is a build up of limestone which can form on the walls or the bottom of your pool.


What is limestone ?

It is a combination of calcium carbonate and magnesium carbonate which forms as a result of a a high TH (Water hardness) .

Water hardness changes depending on your region. It is a consequence of minerals in the soil are picked up as the water passes through.


What problems are caused by limescale?

As well as the look of your pool limestone can also affect the filtration.

The accumulation of limestone leads to the encrustation of impurities and the development of algae.

Furthermore, too much limestone can block the filter.


How to measure the TH ?

The unit of measurement for TH is french degrees  (°F). It can also be measured in ppm.

1°F = 10 ppm = 1g/l

The ideal level for TH is between 100 and 250 ppm (10-25°F). Too low and you risk making the water corrosive but too high a TH can lead to the production of limescale.

It is very difficult to lower the TH of water. However it is possible to increase it, using products like calcium chloride.


I estimate the hardness of your water to help you avoid limescale.

How to control the TH of your water to avoid the build up of limescale ?

With hard water (higher than 250 ppm) : First of all, a high water temperature favours the build up of limescale. Adjust the temperature of your pool to limit the formation of sediment.  Secondly, make sure your pH is between 7.2 and 7.4. To finish, if you can add a sequestering agent to slow down the build up of limescale.

With soft water ( lower than 100 ppm) : Use a product to increase the TH to more than 150 ppm and then adjust the pH.


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