I live up near Shreveport, and after a few years of trial and error, I find that a CYA of 80 ppm is ideal for my pool, and I end up using much less chlorine with the added benefit that I don't have to add it every day, like people who run lower CYA levels do. It's not so bad now, but I think you'll find that when late June/early July gets here, you'll have trouble keeping the Cl from going to zero during the day. However, once the CYA is in the water, drain/refill is the only way to reduce it, so you're smart to just raise it as far as you need to in order to have acceptable chlorine loss. You can always raise it later!

Incidentally, you might check the owner's manual for your SWG--many require CYA levels in the 70-80 range for proper operation and to maximize cell life...

Janet