How to Adjust Pool Water Hardness

total alkalinity in swimming pool

Adjusting pool water hardnessWhere should your hardness levels be?

Calcium has the most influence on the total hardness context of your pool water. Other minerals such as magnesium, iron, manganese and a few others don’t impact the total hardness enough for us to bother with so we stick with adjusting the calcium hardness. The recommended and best range is between 250 and 350 ppm (parts per million) for your calcium hardness.

All of these issues are cared for by us with your weekly pool service.

When Calcium Hardness is Too Low

If the calcium hardness is too low, it can cause problems similar to low total alkalinity in that it becomes corrosive and try to rob minerals from your pool walls and equipment, particularly the metal. This reaction can cause staining as well.

Treating Low Calcium Hardness

Luckily, low calcium hardness can be easily corrected by adding calcium chloride that can be purchased at any swimming pool store. Divide the recommended amount up into three treatments allowing the water to circulate for at least four hours in between.

When Calcium Hardness is Too High

If the calcium hardness is too high, it will cause that white ring around the top of your swimming pool, a build up on all of the pool surfaces, cloudy water, irritated eyes, and can reduce the efficiency of your filter.

Treating High Calcium Hardness

Reducing high calcium hardness is very difficult. The easiest way to do this, although it doesn’t always work, is to replace some of the water with fresh water. If that does not work consult a pool professional, as they will have to add a chemical to keep the calcium in solution that prevents it from depositing.

In Conclusion

The calcium hardness does not influence the balance of any other chemicals in your swimming pool and takes quite a while to cause any damage so it should be one of the last things you worry about adjusting unless you are having consistent issues with cloudy water.

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