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Thread: Spots and Stains

  1. Back To Top    #1

    Join Date
    Jun 2011
    San Diego California

    Spots and Stains

    I'm draining my pool (SWG) because over the past 5 years the CH level is finally so far out of whack I have no other real choice. Over the last year I noticed more and more the stains (blue color) and now spotting. They are generally all smooth to the touch, but have a couple dark spots that are raised lumps on the bottom. I've included some pictures now that the pool is draining and I can see them better. They look much worse when dry.

    Even with my CH too high to even measure by the end of last year, everything else I was able to keep fairly balanced by keeping an eye on it all the time. Before draining, these are the results.

    TA 100
    CYA 50
    FC 5
    PH 7.6
    CH 1000???

    Could not get a proper result for CH, as it was so high, but over the last couple years its been growing higher and higher from fill water. Two years ago I converted to SWG, and that's when I saw the first minor spots, but maybe that was just a coincidence?

    Any ideas on if these are calcium scaling, or something else? There seems to be three different types of stains; large blue color streaking, spots, and raised dark lumps.

    I plan to re-fill the pool right away, but if there is anything I can do while empty, I'd like to; such as acid washing any stains that may come up?

    IG, 13,000 gal, concrete, DE, VS Intelliflo Pump, Intellichlor SWG

    San Diego, Ca.

  2. Back To Top    #2
    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: Spots and Stains

    The splotches look like Calcium scale. The raised bumps are efflorescence. Use the search box to read up on it.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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