If you have a concrete or plaster pool keep the level between 200 ppm and 275 ppm.
Calcium hardness in vinyl pool.
For vinyl pools calcium should be between 150 250 ppm.
If your pool has a vinyl or fiberglass liner the calcium hardness level should be between 175 parts per million ppm and 225 ppm.
Low calcium levels in the pool.
If calcium hardness goes above 400 ppm you will likely see a white flaky crust on the liner and pool equipment.
It also produces itchy skin.
Calcium for a liner pool can be a bit lower than a plaster pool in the range of 150 250 ppm.
Hardness at any level is only an issue in a plastic pool pvc pipes vinyl liner polymer pump if it s high.
A hardness of 10 is fine in a plastic 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.
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.
In general the whole saturation index thing the pool industry has wasted so much paper on doesn t apply to most pools.
Low calcium as is often the case will cause long term serious damage especially to plaster vinyl liners grout in between tiles metal rails and even concrete decking around the pool.
The ideal reading for calcium hardness in pool water is about 200 to 400 parts per million.
Calcium hardness is also very important to the chemical balancing of your vinyl liner swimming pool.
A low level can result in foaming which is unpleasant but shouldn t harm the liner.