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Do those CYA tests go bad? It's not registering any in my water. I've added 6 pucks over the last couple weeks to try to bring it up and still nothing. I have had to drain probably 1.5 feet of water in the last couple months due to all the rain we've been getting but I was at 50 last summer.

First some pics. The plaster is a dark blue so it's not as bad as it looks at first glance but it's definitely getting there in a hurry. This all happened in the last couple days. The pool was crystal clear before and the FC levels have not dropped below target. FC 5 CC 0 pH 7.5 CYA 40 TA...

So I bought this house and had a pool service coming. They kept the water clear but I started to notice a bad chlorine smell. After reading around on here, I decided to fire the pool service and order a TF-100. That should get here Saturday. But the chemistry isn't really what this post is...