I'll post the tap water tests tomorrow. I've never completely drained the pool. I used to take it down a couple of inches 2 or 3 times a season to clean the filter but with the cost of water out here, I've learned to clean the filter out using much less water. # years ago, I had a bad leak, Turned out a tree root under the deck had cracked a pipe and it was fixed. Before that though, I was losing an inch a day for a while. At one point it was down 18-24" and I let it go because i was out of work and money was tight. That was a bad decision because the plaster below the tile line flaked off in some areas so I need to re-plaster at some point, in the off season so I'm not crazy about the idea of changing water out now.

Should I continue with the borax? If I can get the pH up will the CYA come down on it's own eventually? I've read that there are Pool RO services out here where water is expensive. Guess I should look into that cost, though if I have to re-plaster I will need to drain it at some point.