Algae can still grow in water, even under ice. It just grows far more slowly. So you should still keep chlorine in the water, though the rate of chlorine loss will be much slower at the colder water temps and the reduced sunlight. If you have a pool cover, especially an opaque one, then you'll probably only need to add chlorine once every 1-2 weeks -- that's pretty much what I do. The chlorine loss in my pool with a mostly opaque electric safety cover during the winter at < 55ºF water temp is less than 1 ppm FC per week.
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