Do pool chemicals expire? Example: You don't open the pool for a integral year and...

Example: You don't open the pool for a integral year and you have spare chemicals contained in inspired container, will they expire and stop working?
Answers:    They should still be ok, as long as the containers were closed tightly. The simply problem you may have is they may lose some of their potency. Good luck.
as long as the stay dry they're fine. Heat may also alter the chems but once in a blue moon does this happen due to if they did carry hot enough they run a risk of combustion. I'm contained by Texas and run a pool store so I've seen it adjectives