I just got my new test kit and have a question on the relationship between the amount of DPD powder added to a chlorine test sample. The test allows for a 0.2 ppm or a 0.5 ppm titration depending whether the pool water sample is 25 ml or 10 ml. Regardless of the sample size it still indicates to add two scoops of the DPD powder in order to turn the sample pink.

According to this procedure, the amount of DPD powder added appears to be unrelated to the sample size which, to me, seems intuitively incorrect.

What am I missing?

thanks in advance



106,000 litre inground vinyl with solar
Saskatchewan, Canada