Why am I seeing rust spots on my fiberglass pool shell

Why am I seeing rust spots on my fiberglass pool shell

TOP 10 QUESTIONS ABOUT POOL WATER CARE FOR FIBERGLASS POOLS QUESTION 8 : WHY AM I SEEING RUST SPOTS ON MY FIBERGLASS POOL SHELL? Caused by: Mineral deposits. Metal stains. Insects and other biological material break down. HOW DO YOU GO ABOUT SOLVING THAT ISSUE? Remove the spots with a nylon fiber scotch pad and […]