Does DPD Powder have a shelf life?


Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
Laughlin, NV
Pool Size
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Moisture is the culprit in making the R0870 go bad.

Keep it dry, it should work fine. It must be closed very well in your climate.


Well-known member
Mar 26, 2014
San Jose, CA
Yes, I have the same thing. Keep it in a cool dry place away from the rest of your test kit and just fill up the small powder containers when you need it. Much better value than buying those small ones. Just make sure you keep both that bottle and the one in your test kit completely closed. Make sure it snaps shut so no air gets in there. That's what will make it turn to dark grey eventually.

Rocket J Squirrel

Silver Supporter
Bronze Supporter
Jun 7, 2018
Alamo, CA
Pool Size
Liquid Chlorine
For $9 you can get a lifetime supply of silica gel packs. I keep one in the FAS-DPD compartment of my kit case.


Gold Supporter
Nov 28, 2020
New Orleans
Thanks, I will keep it in a ziplock and just periodically refill the small container in the test kit. Right now the bottom of that small container has solidified blue so I will soak it in hot soapy water to clean it up, then do my best to keep the powder dry. I'll keep it in a drawer inside, where the climate is dryer from the house hvac system.

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