Reagents expiration?


Active member
Aug 23, 2012
How long do reagents last? I store them in my garage and I don't see an expiration on them to determine how long I've had them. I have some bottles almost completely full so more likely than not they are newer bottles. I'd rather not replace them if I don't have to but want to ensure I'm prepared before pool opening.Thank you.

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I'm in NJ and we've had a pretty mild winter.

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I have the TF-100 kit.


LifeTime Supporter
Jul 14, 2011
St. Paul, MN
I get new reagents every other year. I haven't ever noticed them being less accurate during the second year. After 2 years I'm usually getting low on DPD powder.


TFP Expert
Platinum Supporter
May 23, 2015
Tucson, AZ
You should not keep them the garage unless you happen to have climate control in there. The reagents are best stored indoors in a cool dry space. Exposure to high heat and/or humidity will do much more to shorten the life of your reagents then anything else.