Just thought I'd pass this on, CYA is definitely effected by cold water. Tested mine today for 1st time in a month or so. Waited a minute and was fairly clear (CYA=0). Then I tested it again, held it in my palm for a minute (and brought it in the house), and presto, CYA = 40, approx. where I thought it should be. Got my Stenner set up, but FC has been above 7 for the past 2 or 3 weeks adding no Clorox. Waiting for it to get below 5 to start up the Stenner.
Anyone started draining their pool because of rain overflow, and forgot to switch it off? I was running on low draining about 4" of water, figured I had some time.... looked out 30 minutes later and down 4 inches (too much). Oh well, hopefully more rain before spring!