4,000 gallon pool
15' x 42"
SF1000 pump
TA: 120
TC: 3
PH: 8.2
CYA: 0
Have 17oz in a sock in the skimmer now.

What is the best way to lower my PH?
I already have HTH PH Minus.

Do I put the PH Minus in the skimmer?