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I am going to do the AA treatment on my pool for iron staining, then drain right after stains are gone, refill with city water and rebalance the chemistry. Do I need to add sequestrant before draining? I don't want iron stains to form again before the pool empties but seems like throwing away...

My pool was using up liquid chlorine fast. It needed a half 2.5g jug everyday and normally use a half jug every other day. So I dumped in 3 jugs in one day, morning, noon and evening to give it a shock. I needed 20ppm chlorine to shock and couldn't get up to 20ppm so I suspected the 10.5%...