If it has been stored in a cool dry place, then many of them are probably fine. Probably the first one to go would be the DPD powder. It probably isn't any good any longer. If it is old and gray and clumpy, I'd toss it out and buy some new. Maybe take a water sample to a reputable pool store and have them test your water and then you test, too and compare and see if you are close to what readings they get. Your test and their test need to be within a short amount of time of each other to make the comparison.

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