Info from Clorox on using their bleach for pools

[fcfrey]

Since I am now injecting a bleach solution with a pump I test every batch I mix up. Today I over-shot on the pumping rate so I decided to mix a weaker concentration. I put one 182 oz bottle of Clorox with two 182 oz bottles of pool water to make what I would have thought to be a ~2% solution. When I tested it ---- it was 3.2% ---- repeated the FAS-DPD test and got the same thing??????? ??????? I did not test the bleach before I mixed it.

My pool water was 7.3ppm but that's a long way from the 6% ?? bleach that it was mixed with.

[chem geek]

Your 3.2% one-third diluted measurement doesn't make sense, even for Clorox Ultra. I don't know what to say. Perhaps try diluting it directly next time. And you are right that your pool water should have minimal effect on the final measurement since it is has so much lower chlorine level than the 6% bleach.