DPD powder

[Watermom]

DPD powder does go bad. You may just need to order some new.

[waterbear]

Then it probably is bad. How many scoops did you add?

[Poolidiot]

I added 1 scoop the first time then 2 the 2nd time...it is not even a year old

[let_her_flicker]

I have ordered DPD powder for my PS233 kit from Ben for about 5 years now. Last year I did a comparison. I tested the new and old powder side by side. New powder was white and the old powder was darker, had some clumps in it, but it was not black. I crushed the clumps with the spoon.

Both measured exactly the same. That was my experience. I did not keep checking the powders until they did not measure the same. I do know that the darker powder still did its job, but at some point I am sure there would be a difference. Time wise, the darker powder I check was 14 months old, kept inside, and was never wet.

Hope this helps.

Harry

[waterbear]

Did any pink color develop at all? You might want to try adding scoops of the DPD powder and see. Taylor recommends two scoops for normal testing and more if the chlorine levels are high. You might want to try 3 or 4 and see what happens.

[PatL34]

I should probably get new DPD powder, as when I add it, the sample can get dirty red. It then makes it difficult to find the endpoint, even when testing for CC. I think I should get new powder.

Pat