How can a stained gunite pool be cleaned?

To clean a stained gunite pool, follow the steps below:

  • Identify the location of the stain(s). They are usually found near the top edge or just a few inches below the water line.
  • Drain water out of the pool to expose the stains.
  • Prepare muriatic acid solution as instructed in the container. Apply the muriatic acid solution thoroughly into the spot.
  • Scrub the stains by using a polyester-nylon blend bristle brush.