4 Rules for Storing Pool Chemicals in Winter
Keep them in a dry, cool place above freezing A garage or shed that stays above 32°F works fine. Store chemicals on a shelf, not directly on a concrete floor.
Protect from moisture Keep lids tight and containers upright. If your garage is humid, put chemicals inside a plastic tote with a lid.
Never mix chemicals, even for storage Store each chemical separately. Keep them away from anything flammable or metallic.
Do not leave them outside Rain, snow melt, and direct sunlight will ruin pool chemicals quickly. Inside the house is unnecessary unless your storage area freezes.