Very new to this site. Seems very cool
My daughter had friends over and one had a bobby pin fall out in the spa.
I noticed rust stains about a week or so later. I put vitamin c tabs on the rust stains and it left dark blemishes.
i used city water to fill the pool. It is salt water. Chemistry is fine.
The stains dont brush out. Any help on ideas. Anything that can brush out these stains? Pebble Sheen finish. 3 months old.