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I have read on this site that calcium hardness is not that important for a vinyl pool. What about for my heater? And how about my aggregate concrete surface. I do notice more stones missing every year from the surface of my concrete that surrounds the pool area. Also, where is the best place to...

How often must I update my reagents? Mine are exactly one year old. I have the tfp-100. Also, when doing the FC test, I put a second vial with clear pool water in it to compare with the vial I'm testing. The question is, should the testing vial be brought to be as clear as the plain pool water...

I just received my test kit! Since I'm color blind, I waited for my wife to come home to help me. My results are: FC 6.5 CC 1.5 TC 8 ph 7.5 t/a 200 cya 60 temp 72 I'm a newbie, any help would be appreciated. I would like to get my t/a lowered of course, and raise my cya to 80. When testing the...