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Calcium Hardness

Calcium is a mineral that is always present in your water and hardness is the measure of how much dissolved Calcium is present (whether the water is soft or hard). In addition to pH and Total Alkalinity, Calcium Hardness must be kept in balance. The ideal range of Calcium in your Pool depends on the type of Pool surface you have. Vinyl liner, painted and Fibreglass pools need at least 170 ppm and levels up to 400 ppm are acceptable. Concrete pools need a higher stating point of at least 225 ppm.

If the Calcium Hardness level becomes too low (soft), the water becomes corrosive causing damage to;

  • Pool equipment
  • Pipe fittings

It can also cause your Pool water to have a green tinge.

Calcium level can be increased by simply adding Hardness Plus to the water.

If the Calcium Hardness becomes too high (hard), the Calcium leaches out of the water and becomes a solid causing the water to become cloudy and Calcium to form on the surfaces and equipment of the Pool. It can also;

  • Shorten the life of your liner
  • Cause rough surfaces
  • Clog Filter and pipework

To reduce the Calcium Hardness level, you will need to partially drain down the Pool and top up with fresh water and also add a Flocculent to get rid of the cloudiness caused by the Calcium deposits. It will also need brushing every day to help with the scale removal.