I never test for combined chlorine before because everything I read here talk about FC but since it's the end of the season and I had a little time, I decided to test for it.
my routine has always been test for PH and FC and adjust
Target for PH is always 7.2 to 7.5 and FC I always try to keep it at 4 whenever it's time to add chemical.
Should I be testing for other things like AK and Calcium often? Last I check at the beginning of the season my Calcium was like 350 to 400.