DPD powder experiment

[LITTLEJJ]

I have a PS233 kit, but did not use it this year. I am building a pool now and am curious what will still be good in it. I know the DPD powder is bad, but what is the shelf life on the rest of it?

[Poconos]

Don't be too sure about the powder. May be perfectly good considering what I found in the experiment. I'm not sure of the shelf life of the individual components but I do keep bulk chems in the fridge and only open them to refill smaller bottles. Under these conditions they should keep almost indefinitely. Certainly you'll get a couple seasons out of them. Just keep them cool and out of the sun.
Al