Hi, I wonder if you guys can shed some light on a question or two that I have please ?
I have been using the dichlor / bleach method for a couple of months in my SPA. The numbers are pretty good and things act as I expect. I have a Taylor K-2006, but I also have a Taylor K-10XX kit. The K-2006 uses DPD-FAS, the K-10XX uses the DPD method. In many posts I see here, everyone says the DPD-FAS method is better, but I have not seen a good description of why. Is it just that it's more accurate or is it because you can easily get a CC reading ?
I would expect both kits to give similar reading for FC, but the K-2006 always reads higher. Once when I read FC=2 with the DPD kit, the DPD-FAS kit read FC=5. Another time, when the DPD read FC=5, the DPD-FAS read FC=8. It often seems to be about 50% higher. I am doing the 0.5ppm version of the test and diving the number of drops by 2, with the DPD-FAS test.
Anyway, because of this, I changed the reagent in the K-2006 for a new bottle, but the new one was exactly the same as the old. So then I changed the reagent #2 in the DPD test and the old and new reagents there gave the same results too.
So, I'm wondering why the DPD test reads a quite different reading from the DPD-FAS test. Can anybody explain that please ? Do I need to go get a control sample to measure to calibrate the test (seems weird to have to do that) ?
Any advice ?
Jaccuzzi J-375 SPA