Keep them dry and separated.

Separate, dry, and cool. That’s the short answer.

Pool chemicals don’t freeze easily, but moisture is the real enemy. Moisture makes chlorine tablets turn into gas, and that gas corrodes everything nearby — metal, walls, your lungs. So store them in a sealed, airtight container if the original bucket is compromised.

Keep acids and chlorine far apart. Like, opposite ends of the garage shelf. If they mix, you get chlorine gas, which is not how you want to spend New Year’s.

Room temperature or slightly cooler is fine. A garage or shed works, but avoid direct sunlight and concrete floors that might get damp. Elevate the buckets on a pallet or a shelf if you can.

And label everything. Future You will thank Past You when spring comes and you can’t tell which white powder is which.

The only thing you really shouldn’t do is leave them outside uncovered. Rain + pool chemicals = bad news.