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Thread: Dusty gray staining on fiberglass pool

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    Dusty gray staining on fiberglass pool

    I have an in ground pool that was originally gunite. 13 years ago I had it fiberglassed. It held up very well until recently it developed some chipping of the surface. I had a company redo the surface. They essentially sanded the old surface and recoated the fiberglass. It looked fine for a while. Now I'm noticing that the walls of the pool seem to have a dusty gray coating. It is most predominant near the water returns. It does not brush off, but I can wipe it off with my hand. The chemistry has been checked and it's good. The pool is approximately 23000 gallons and I have a DE filter which I recently disassembled, cleaned and recharged. Can you offer any suggestions as to what the problem/solution might be? Thank you.

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Dusty gray staining on fiberglass pool

    Welcome to TFP!

    Nothing comes to mind right off. However, you should post a full set of water test results. There is often a clue in there.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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