Due to some issues just after building the pool, we got a lot of iron dust in the pool due to rebar grinding, etc. and had severe staining on the floors and walls. I was able to get it out with citric acid and continued to use a sequestering agent to keep it out. However, I stopped using the sequestering agent and now the stains have appeared on the walls - not nearly as bad as before, but noticeable.
My plan is to remove the stains again with citric acid and then drain the water so that I don't have to keep adding sequesterant.
I will remove half at first - refill, remove half and then refill which should leave only 25% old metal water. Water is cheaper than renting a pump to drain the water under to pool to keep it from floating.
Any other way I should do this? Any other things I need to consider?