I've got an Autopilot SC-60 that was running around 25% on level one for my 20,000 gal IG. I worked it up to 65% over the last two weeks to keep up with the increased usage and sun. Yesterday I went to Level 2 and 25%. I'll try that for awhile.

I did dump in 3 gallons of bleach after the Tropical Storm dumped about 6" of water into the pool overnight on Tuesday. Fourtunately, that will help reduce my CYA down from 100 when I drain it back down today