Dave, you were right on. My chlorine has disappeared! We added 3-182oz bottles of 6% bleach late yesterday afternoon (546 oz vs 544 oz in Bleach Calc!). New readings fresh from the pool:

pH 8.2- (rather than +) Total muriatic acid added is 1/2 gallon - we'll do more
Total Cl 0
Free Cl 0
TA 110 (added 10# of baking soda last night)
CYA less than 30 (redid this test, still not really confident in this measure, as the dot disappears(?) when the solution is right at the very, very top of the vial; another drop and it would spill over)
Calcium hardness 70-80

My Cl really "shocked" me, as there was no change in color for either test! Actually called the 800# to see what high chlorine would register on tests that only go up to 5.0 (I was hoping they'd say "clear"). They said I should see an intense orange color if I were holding Cl levels above 5. I can see I need to get a test that can measure high chlorine levels. Whenever Ben's kit arrives, will it register shock levels, I wonder?

So, I'm guessing that I should continue to add Cl to shock levels until it can hold Cl overnight? - seems like I read that somewhere???

Sandy