Hi, wanted to post update:

***!!!Alkalinity reading dropped to 130 ppm today!!! It's been over 200-250 for 4 straight years. It could have dropped anytime between the 10th and today since we tested 200 on the 9th. YAY! The aeration worked as you wrote it! YAY!!!***

pH rose to 7.2 also on it's own. As per instructions, we are still aerating until our pH is at or above 7.6 again. I'm not in a rush to add Borax until you say so. I read another current post where you said higher pH helps clear up the CC / Amonia problem quicker. But i still want to wait until im told its time for us to add it. No two pools are exactly the same so I'm sure no two "plan of attacks" are either.

Therefore.....Still battling CC and the mysterious loss of all newly added Chlorine.
1:00 pm - Vacuumed and backwashed filter today to lower rain-induced water level by 2".
5:00 pm - Added 2 gallons 12.5% liquid shock
7:00 pm - HTHs OTO TC=2.0-ish yellow
7:25 pm - added 2 more gallons 12.5% shock
9:00 pm - HTHs OTO TC= ?? 3.0 for sure. Couldn't discern if it was as dark as 5.0. Didn't look yellow-"orangy" - just darker yellow.
Did a second OTO (Pentair) TC=3.0 yellow. Not sure if it was much darker than that. Hmmm. 50 ppm chlorine added since 7pm. Why no orangy-yellow?
Did a quick FC chk with K2006. FC>=7.0 CC =? (>3-4+++)
Got 7.0 minimum - could have been a tad higher if 1-2 more drops added to seal perminent clear end result. But it wouldn't have taken us much beyond 8 i dont think.
Didn't have enough titrant to measure CC but we know we added 12 drops before running out and still had dark Pink. So we at least have 3-4 ppm but probably much higher.

We'll test water in morning to see if chlorine drops below 2.0-3.0 overnight or not.
One last reminder, our pool is sparkling clean and we haven't noticed any odd smells or colors/dirt. We now just need a way to accurately measure our chlorine and know when it's safe to swim and when to add a dose.

Happy Mother's Day to any Mom's browsing through this post!