DPD Powder



Can DPD powder (perhaps the concentration) change over time.

I shocked my pool on opening and the pool stayed at shock level despite being very green for 3 hours (before hiting the sack). Pool looks better in the morning. I didn't test before heading to work so no numbers besides last night -

CYA - 45
PH - 8.2
FC - 17

Always a distinct possibility I am doing something wrong...


TFP Expert
LifeTime Supporter
Apr 4, 2009
If the water turned pink, it should be fine. Count each drop of R-0871 as 0.5ppm if using a 10ml sample :goodjob:


Mod Squad
TFP Expert
Platinum Supporter
LifeTime Supporter
In The Industry
Apr 1, 2007
Sebring, Florida
Yeah, the DPD powder will stay good for a while....it will start to turn darker and darker from almost day one but as long as it turns the sample pink/rose, the test is valid.

You didn't ask but you need to get your pH down.....sooner rather than later

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