Extreme heat and chemicals

[Calisoldier83]

I bought a deck box for all my Jacuzzi supplies. I was wondering if the chemicals would be okay under 100+ degree temperatures.

Should I bring any or all indoors during the summer time or are they fine in the deck box exposed to such temps?

[The Wizard of Spas]

Always store chemicals in a cool, dry location out of direct sunlight, regardless of the time of year.  Same goes for testing equipment.