Took a sample to the pool store over Memorial Day Weekend, got the handwritten test results mentioned above, which were:
Problem: Green
FC:
TC: no
pH: low - OK
TA: 40
CH: 90
CYA:ok
They had me add 15# Alkalinity+ (broadcast 4# at a time every 3 hrs), 42# of Calcium (deicer type), 9 Gal of...