A hardness of 10 is fine in a plastic pool.
Calcium hardness in vinyl liner pool.
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.
For vinyl pools calcium should be between 150 250 ppm.
A low level can result in foaming which is unpleasant but shouldn t harm the liner.
Low calcium levels in the pool.
If your pool has a vinyl or fiberglass liner the calcium hardness level should be between 175 parts per million ppm and 225 ppm.
Calcium on the low and high end of the scales will eventually cause problems and when they do be ready for some serious problems.
Hardness at any level is only an issue in a plastic pool pvc pipes vinyl liner polymer pump if it s high.
High calcium is rarely a problem if other lsi factors are adjusted properly 500ppm calcium hardness is easily managed without scale formation.
Truth be known vinyl liner and fiberglass pools are likely to decline faster in a low calcium environment.
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.
If you have a concrete or plaster pool keep the level between 200 ppm and 275 ppm.
Calcium for a liner pool can be a bit lower than a plaster pool in the range of 150 250 ppm.