Re: Draining pool
A little more info could help, as you may have major issues if you're draining an IG vinyl pool (liner wrinkles, failure, collapse, etc).
My CYA was "off the charts" (150+ ish) and I brought it under control with smaller drain and fills + natural dilution from rain. It took about 18 months, but I'm actually going to have to add a couple pounds this spring as I'm currently less than 30.
Are you using pucks, bleach, or SWC to chlorinate? That will make a difference in your methods as well. If you're using pucks, then stop and switch to bleach. If you're using bleach, a few 1/4 to 1/2 drain and fills will get you where you need to be without a total flush and fill. If you're using a SWC, then just jack up the output to maintain FC according to the best guess chart, and you'll be OK until your CYA drops off naturally or you do smaller drain/fill cycles.
Nater
16x32 Vinyl IG, 20,000 gal, Autopilot DIG-220 w/60 series cell, Dolphin Diagnostic Pool Boy
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