I used HTH Algae Guard. It says it kills and prevents.
I have a cheaper 5 or 6 test kit. It doesn't have FC/CC, just one chlorine reading with the yellow drops, I believe it's an HTH 5 or 6 way kit, not a FAS-DPD, but I am going to get one. The CYA test has a tube with a dot on the bottom and...