I know at some point I read instructions on a way to do the DPD chlorine test for high levels of chlorine where you use less reagent. I can't find that post now... does anyone know what I mean? It was something like use a 25ml sample and multiply by .2 instead of .5, but I want to make sure I get it right. Thanks.
DPD testing instructions that uses less reagent
- Thread starter MeSue
- Start date
I am assuming you mean the FAS-DPD test, the one that starts with a small scoop of power turning the water pink.
Using a 25 ml sample and multiplying by .2 requires more reagent than usual.
You can mix the pool water one to one with distilled water and test that. Then each drop will be 1.0, which means fewer drops and a faster test but you lose precision.
Using a 25 ml sample and multiplying by .2 requires more reagent than usual.
You can mix the pool water one to one with distilled water and test that. Then each drop will be 1.0, which means fewer drops and a faster test but you lose precision.
MikeInTN said:
That's the way I usually test. I have never really felt that I needed the accuracy of 0.2 ppm. Saves me on reagent which is good since nobody around these parts carries R-0871.
257WbyMag said:
I bought a pretty good sized bottle of R-0871 online from these folks Swimming Pool Supply . In fact, I use them for all of my refills. The reagents are shipped direct from Taylor Technologies.
I'm thinking i got the 2 oz bottle of R-0871 (it's DPD#2 on the website, I think).