

Orange dirt spots on fibreglass pool walls
Cleaning the pool before this season I noticed some weird orange dirt spots on my pool which I have never seen before. Tried cleaning them with ascorbic acid, clorine, limescale remover and even a bit of bleach to see if anything would help but they won’t budge. What could they be and how to get rid of them? They only appear on one side of the pool which I find strange.