Here are my friend's numbers from the TF Pro 100 test. What do you suggest she do next? She has been draining and refilling to lower the CYA.
19000 gal, vinyl, auto cover, Pentair heater, robot, Pentair superflo vs pump, Indiana
FC 2.5
CC 1
Hardness 300
Alk 190
pH 7.5
CYA 180
Separate copper...