If you have a concrete or plaster pool keep the level between 200 ppm and 275 ppm.
Calcium hardness vinyl pool.
Dip the test strip dip the calcium hardness test strip into the pool water.
But what it depends on isn t that difficult.
Fortunately calcium hardness changes rather slowly so a once a month testing and adjustment should be all you need.
A low level can result in foaming which is unpleasant but shouldn t harm the liner.
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.
The ideal reading for calcium hardness in pool water is about 200 to 400 parts per million.
Calcium for a liner pool can be a bit lower than a plaster pool in the range of 150 250 ppm.
Calcium hardness is also very important to the chemical balancing of your vinyl liner swimming pool.