I'm planning on doing the ascorbic acid treatment to remove some iron stains, before I close my pool in September. I live in michigan so the water that is left in the pool over the winter will freeze. The water will be drained below anything in the pool that contains metal (screws, skimmer opening, return opening, etc.) Is it possible for the iron stains to re-form over the winter when the pool is covered, and be visible next spring when I open the pool?