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Thread: Brown Scaling on Bottom of Pool

  1. Back To Top    #1

    Join Date
    Jun 2014
    Richardson, TX

    Brown Scaling on Bottom of Pool

    Hello Everyone,
    New pool owner here, I am very DIY guy, so hopefully this is an issue I can work out with you all instead of calling a professional. $$$$.
    We just moved into house and we have a ~30K gallon DE filter pool. We have noticed a brown scale at the bottom of our pool. What is causing this and how can I clean it up?
    I have my chemistry specs here: (Keep in mind I am new)
    Total Chlorine- 4
    CYA: 151
    PH: 7.8
    Tot Alkalinity: 99
    Adjusted Alk: 54
    Total Hardness: 352
    Please let me know what I can besides draining, I heard something about a no drian acid wash.

    Thanks everyone!

  2. Back To Top    #2

    Join Date
    Jan 2013
    Houston, TX

    Re: Brown Scaling on Bottom of Pool

    Welcome to TFP!

    Out of the gate you need to get your CYA under control or get your CL up into the range where it can actually sanitize the pool at that CYA. See This Chart. Your target at CYA of 150 is a minimum of 11 with an upper normal range of 18.

    Once we get the basic chemistry under control we can tackle the scale / stain.

    What are you using for testing?

    - - - Updated - - -

    can you post up some pictures?
    TFP Moderator Chris V. ~16K Pool & Spa, 48NSF DE, IG Plaster Circa 2000, Intermatic PE653, Challenger pump with a 2 speed B2984, 20gal stenner chlorine injection, Houston, TX
    One cannot follow Islam and Christianity at the same time, nor can one follow pool store methods and TFP at the same time.
    Pool School -- Pool Math -- TF-Test Kit

  3. Back To Top    #3
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Brown Scaling on Bottom of Pool

    Do the "brown scale" feel rough or smooth? Rough probably means calcium scaling, while smooth might be metals stains or some other kind of staining.
    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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