facing the same concern...i would like to just take the whole thing (reel and cover) and put it in my garage..it probably gets as low as -15C in the worst of winter. unless i find out otherwise though, i think i'm going to have to roll it up and put it in the basement for storage for the winter. here's some starting tips from a site i just looked up:
Storage
It is recommended that your cover is cleaned and dried before storage over winter, preferably in a bag away from hot pipes, chemicals and vermin.All that is required for the cleaning of your solar blanket is a soft brush and clean cold water. Any time you plan to store your blanket away, it is important to make sure that you hose it off any chlorine with clean cold water. This will prevent chlorine concentration, which is damaging to the life span of the blanket. Mildew or algae build up can be easily removed by lightly scrubbing the solar blanket with a soft brush or rag. These substances are not damaging to the solar pool blanket. If you are planning to store your blanket for long period of time, (i.e. over winter) allow it to dry first, to prevent the growth of any mould and mildew.


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