I'm going to need to drain the pool due to high CYA. (I estimate it around 250.) According to the pool calculator, I need to replace about 80% of the water to get a CYA of 60. Jason has said that I would be able to drain and refill it myself and that I would need to leave about 1 foot of water in the shallow end to avoid problems with the liner. So, anybody know about how much water it would be if I drained down to only 1 foot left in the shallow end? (I have a 3 foot shallow end, rectangular pool) That's still alot of water left in the pool. Would I do the drain and refill, then test the CYA again, then drain, refill, test, again and again and again? Also, if it were you, would you start doing this now or wait until spring?