I'm new and just received my TF 100 kit. I tested the chemicals and then, as a check took them to my local Pool Supply Store for their analysis.
We differed in Total Alkalinity - I found it at 100 yesterday, then rechecked today and it read 90 (I probably did it wrong yesterday). The pool store said it was 75 and wanted me to add 4.2 lbs of "Total Alkalinity". What should I do?
Also they found CH at 320, while I found it at 475 (both times).
Any recommendations would be great.