If you have a concrete or plaster pool keep the level between 200 ppm and 275 ppm.
Calcium hardness in vinyl pool.
Dip the test strip dip the calcium hardness test strip into the pool water.
Hardness at any level is only an issue in a plastic pool pvc pipes vinyl liner polymer pump if it s high.
In general the whole saturation index thing the pool industry has wasted so much paper on doesn t apply to most pools.
For vinyl pools calcium should be between 150 250 ppm.
Calcium for a liner pool can be a bit lower than a plaster pool in the range of 150 250 ppm.
The ideal reading for calcium hardness in pool water is about 200 to 400 parts per million.
If calcium hardness goes above 400 ppm you will likely see a white flaky crust on the liner and pool equipment.
If your pool has a vinyl or fiberglass liner the calcium hardness level should be between 175 parts per million ppm and 225 ppm.
Fortunately calcium hardness changes rather slowly so a once a month testing and adjustment should be all you need.
Here s why it happens.
If a vinyl liner s calcium level is too low this soft water situation could lead to foaming and other water problems and can harm the vinyl.
Calcium hardness is also very important to the chemical balancing of your vinyl liner swimming pool.
A hardness of 10 is fine in a plastic pool.
Low calcium levels in the pool.
Calcium on the low and high end of the scales will eventually cause problems and when they do be ready for some serious problems.