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Nov 29, 2012
White Stain Above Water Line
by: graham

I have a 18 month old fiber glass pool. It has just evaporated some water and a white mark has appeared around the pool sides above the water mark.

When I rub this it disappears, but then reappears after 5-10 mins. It has not stained the pool and it does not feel like anything. I have used buffer as advised by my pool shop, magic eraser etc...but to no avail....

Has anyone ever come across this as everyone I speak to are stumped!

Thanks for the question Graham

Without a full set of chemical readings it's a guessing game right now, but here are some things to can look at.

You might be getting metal stains through metal in the fill water. Quality product like Jacks Magic Pink, Blue, or Purple Stuff or Proteam's Metal Magic work very well. Get you water tested for metals.

Keeping a lower pH (7.2 - 7.4) and lowering the TA (70 - 80ppm) may help the stains from reappearing. Metal stains are sensitive to the pH level. Around 7.0 pH it's hard for the metal to stain and above 7.8 is very likely.

Iron can also be present in pool water when you have rusting pats like screws and other metals such as ladders.

If you need immediate assistance (within 24 hrs) or for emergency personal assistance, you can make a donation of your choice and I'll answer your questions by phone.

Contact Me


Hope this helps.


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