Brown staining on white fiberglass spa

[dean701]

I have brown stains on my fiberglass. Any ideas how to remove it them?

 

[mknauss]

Welcome to the forum!

Try reading this. Pool School - Metals in the Water and Metal Stains

 

[Richard320]

I have brown stains on my fiberglass. Any ideas how to remove it them?

Try a Vitamin C tablet first. Plain Vitamin C, the cheapest you can find at the drug store or what you can beg from a health-fiend friend or relative. If you get this

It's metal.

If that doesn't lift it, then set a trichlor tablet or puck on the spot for about five minutes. If it lightens, it's probably organics and time and high levels of oxidizers (bleach or whatever you use in a bromine system) should fade it.

The good news is, if it's metals and since it's a spa, you can afford to drain and refill, so you can treat the metal staining and then replace the water and be rid of it for keeps