Adding calcium to pool
So whenever I go to the pool store at the beginning of the season to have my water tested (like now lol), the print out always includes the addition of calcium (along with the usual ph and alcalinity products). Do I need and should I be adding calcium? One guy once told me if the water doesn't have enough calcium, it will leach elsewhere. I guess this would make sense on purely concrete pool. My pool is concrete with a vinyl liner, so the water doesn't touch any concrete.