In a calm and friendly voice I just told them that they really messed me up on my last visit. They really didn't know what to say but suggested that they manually check the stabilizer on this visit. The manual reading was 60 and their machine reading was 51 which wasn't too far apart.... By the way, 60 matched the reading I had just gotten from testing the same water at Pinch a Penny.
My point with all of this is that in my opinion Pinch a Penny that uses wet chemistry testing is more accurate and reliable than strip testing with machines that detect colors shades. As a result, I just don't have a lot of faith that the machines in either of T&D's stores are as accurate.
As I said in a previous post, pools are pretty forgiving and plus or minus 20% or so is probably close enough to keep water clear and safe. Unfortunately for me, the original stabilizer reading I was given was 40 vs 104 which resulted in me having to replace 2000 gallons of water. Lessons learned for me is to get a second opinion before adding stabilizer ( as well as salt ) since the only remedy is replacing water to bring the values down if they are inadvertently overdosed.
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