I just set up my tub after being in storage for several years. I purchased all new chemicals but I was wondering since I have so much from 3 to 4 years ago I hate to just toss them. They have been stored inside but they were exposed to heat and cold as they were in a storage facility.

Any thoughts on that?

I never use chemicals that are over 1 year old...sorry.

It's basically very easy to verify if those chemicasls are still good. If you have ( for example) Chlorine granulars which are a few years old, then simply put them in the spa. Take a Cl2 reading before and after. If it goes up they are still ok " title="Cool" />