I have been using a color q water tester and thought that it wasn't reading correctly. The pool store that I was comparing it to is using an electronic strip reader attached to their computer. My results are way off from theirs. I am trying to lower alkalinity by lowering ph with muratic acid and then aerating. I was getting tired of running to pool store to sample my water while doing this, because I thought my tester was not working. So I bought some hth 6 way testers to keep track of my progress. To my surprise the hth strips match my color q tester very close, although I cannot test TC with the hth strips, the FC on both read close enough to assume the TC on the color q is correct. Ph, ALK, and CYA all match my color q.
I was about ready to send the color q to Lamotte, after talking to them they said they could check it out for me. Reagents I am using have 1 year left before expiring.
So my question now is do I believe my color q and the hth strips or the pool store?