How long do the K-2006 chemicals last?

[rdefino]

I have a test from about 3 years ago and was wondering if the chemicals are still any good?

thanks

[Watermom]

It it has been stored in a cool, dark place, then likely. The one that seems to go bad first is the DPD powder but it will be obvious to you if it is bad. It will be real gray and clumpy.