Quote Originally Posted by tmmort
I was exactly in your situation about a month ago (CYA 150+, also high CH). So I rented a sump pump from a pool store and drained it until the entire shallow end was dry - I estimate 2/3 of the water out.
What was your CYA after the drain? I was anticipating I'd need more than one partial drain, but perhaps not. I did check the regs for where I live.