I have changed the title of the thread to reflect latest status.
As an absentee pool boy with two kids and a recently moved father-in-law who has projects at both old and new houses and my own projects - I have yet to get the time to confirm the condition of the multiport or the presence of sand leaking into the pool - but the pool is clear and well balanced.
My plan is to get around to socking a return with a small stocking, and then this fall when it's closer to closing time I'll examine the filter, the multiport, the laterals, etc.
Today's numbers:
FC:8.0
CC:0.5
pH:7.2 (Typically 7.5-7.8; Lowered to 7.2 on purpose - aerating now to bring back up)
TA: 80 (Originally 180, then 120, now 80!)
CH: 280 (Originally 350+, then 330, now 280)
CYA: 50? (Originally 55-60)
Pool is still clear, Polaris is working great, pulling a 1-2 TBS's of sand out a week along with other junk.
I'm thinking about adding Borates at some point... not 100% sure yet.
TA & CH & CYA have all had some changes due to backwashing and filling and rain and drain. No major effort to pull these down this way. TA may have been mismeasured originally - I was going too slowly in my testing. After changing test methods it dropped to 120 rather abrubtly. Then from there it was adjusted down using 11lbs of Dry Acid (slowly a 1lb - 2lb's at a time). I'll probably switch to MA since I just bought 2 gallons today - nearby Leslie's DOES NOT CARRY MA or Liquid Chlorine - they say there is some local ordinance. I got the MA from Home Depot - $13 for 4 gallons - is that good?
Anyway... thanks to all of you for your various efforts to help. I didn't start with a swamp, I was pretty clear to start - but you've helped me learn and keep things going. I have some mechanicals to take care of as things wind down this year - but the overall outlook on the pool is excellent.