Calcium Hardness


LifeTime Supporter
Jul 29, 2007
I know that pool school says my calcium can be as low as 50 for a vinyl liner, and I have always read that it doesn't matter in a vinyl pool... but does it matter for a SWG system? My Aqua Trol manual says calcium should be 200-400 ppm and mine is 120. Do you think I need to do anything about this?