40,000 gallon gunite pool that was completed November of 2018 it was fine through most of the summer of 2019 then developed this. It is reddish pink in color and a steel brush will not scrub it off ... seems to have hard white nodules under it in places
What might this be
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- Last Post 17 April 2020
Pink can sometimes be algae but that would usually brush away. You could rub a chlorine tab on and see if lightens up. If it does, it's an organic stain and can be treated with chlorine.
More often it's a metal stain. You can rub a vitamin C tablet on it and see if it lightens up. If it does, you have a metal stain.
Do you fill your pool with well water?