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
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?
Rob thanks for the reply…
The pool is filled with city water … I’ve tried the vitamin c test to no avail… I can get the red/pink color out of it for the most part but then I’m left with big white spots under where the red was that wont scrub off when it’s gone … any suggestions
40,000, wow that’s a huge pool.
Have you tried a pumice stone? That may remove the white spots.
Will try that this afternoon and report back thanks
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