Getting pretty good with the K-2006 but, just for fun, I went back to my pool bulider today to get a sample tested in their Biogard ALEX computer tester. Readings were nearly identical to mine with the exception of a couple. Their computer tested CYA number was 77 while their manual kit said 60. My test was 60. His view was that the computer generated numbers were often off and he relies on his eyeball to arrive at a better number. Anyway, as I have an SWG pool, looks like I need to raise it another 10 or so.
The computer tested TA was 76 and an Adjusted TA (takes into account the impact of CYA) of 53. My test kit number was 80. So the question is, when I enter 80 into PoolMath does it "adjust" it for me in calculating things like CSI?
BTW, in the proud tradition of pushing chemicals, their recommended treatment as a result of their testing was that I add 14 lbs of Balance Pak 100 (which, by my calculations, would raise TA to 154 and the adjusted TA to 107....they seem to like an adjusted TA of around 100) followed by adding 1.5 pints of MA to hit a 7.5 pH target.
At any rate, if I did all their treatments, I'd wind up with a CSI of 0.1. If I do nothing, my current CSI is -0.1.....guess I'll do nothing and save a few bucks on baking soda and acid.....