Brown circle stains and wall stains

Jul 1, 2012
1
#1
We have a San Jaun pool and recently noticed that there are some new round stains on the floor and walls of the pool and advice would help. We don't use a well but with the 100' degree weather we have been adding alot of city water. We have a white fiberglass pool.
 

JasonLion

TFP Expert
Platinum Supporter
LifeTime Supporter
May 7, 2007
37,879
Silver Spring, MD
#2
Welcome to TFP!

Fiberglass stains even at fairly low levels of metals in the water. Try placing a vitamin C tablet on one of the stains. If the stain lifts around where the vitamin C tablet was then they are metal stains. If the stain is unaffected it might be something else entirely.