For vinyl pools calcium should be between 150 250 ppm.
Calcium hardness vinyl pool.
Calcium hardness is also very important to the chemical balancing of your vinyl liner swimming 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.
A low level can result in foaming which is unpleasant but shouldn t harm the liner.
Fortunately calcium hardness changes rather slowly so a once a month testing and adjustment should be all you need.
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.
If you have a concrete or plaster pool keep the level between 200 ppm and 275 ppm.
Dip the test strip dip the calcium hardness test strip into the pool water.