In a pool with CYA in excess of 100 ppm, what's the best way to test chlorine which will need to be between 15-30 ppm?
Rangeball said:Thanks Guys.
That looks to be the way to go, and the ones I linked appear to be the same one's you linked.
CaOCI2, when you are testing for the combined chlorine, I assume you don't count the 5 initial drops of DPD?
The colormetric DPD test is different from the FAS-DPD titration test. A DPD test will beach out at about 10=15 ppm FC unless you dilute the sample with distilled water and multiply the test results by the dilution ratio. FAS-DPD can work at much higher FC levels since if the DPD bleaches out you just add a bit more until you get a stable color and then you titrate to endpoint.Rangeball said:50 ppm would be plenty.
Why does taylor's website say DPD will bleach out above 10 ppm if DPD/FAS goes to 50 ppm?
I'm sure I'm missing something.
Also, Both my dad and I plan on getting Dave's kit when our current one's run out, but in the meantime can you buy just the DPD/FAS as a stand alone?