Put the resin in your apartment for the winter. You'll be glad you did come spring. When the resin gets cold it begans to crystallize--you'll see small white specks in the resin. Crystallization is reversible. I heat a large kettle of water on the stove and put the resin container in the water. The crystals should dissolve before the water boils. It can be tough to get crystallized resin out of pumps.