Quote Originally Posted by jnorris
The reason I'm testing is, I sometimes use Cal Hypo to shock, and I wanted to make sure my calcium level wasn't high. I do have a propane heater though, so what should my calcium level be (vinyl pool)?
Excellent reason to test for CH in a vinyl pool. I know someone with the AC test and I'll try to get by there this week to see how it reacts with a sample of my water and compare it to the Ps233. My guess is to assume once the colors changes, that is the point in which you judge. You may want to get a sample tested at a local pool store (watch out for the sales pitch! ) and compare with your reading. Now, as far as the recommended level for a vinyl pool with a heater I would suggest no higher than 300 ppm (should give a little wiggle room) however you should check with the heater manufacturer to be sure.

Dave