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Thread: Pool stain identification

  1. Back To Top    #1

    Join Date
    Apr 2016
    Loxahatchee, FL

    Pool stain identification

    Good morning!

    Here are my water test results from yesterday:

    FC 4.5
    CC 0.5
    CH 675
    TA 210

    I also just purchased the speed stirrer so I can't wait for that!

    I have some stains on the plaster and I was hoping someone could help me identify and hopefully fix.

    The one on the top is dark, almost green in color and the one on the bottom I think might be calcium.
    dark stain.jpgwhite stain.jpg

    Any idea on how I can get rid of these?
    18500 gallon oval pool. Filter: Hayward cartridge filter. Model: C12002. Pump: Hayward 1 speed (I think) 1.5hp Max-Flo XL Pump. Model: C48D43AO4. TFT100 test kit.

  2. Back To Top    #2
    Mod Squad Texas Splash's Avatar
    Join Date
    Jun 2014
    South-Central Texas, Marion/San Antonio

    Re: Pool stain identification

    Good morning. I didn't see your pH reading above, but here are some basic rules for ID'ing stains:
    - Hold a chlorine tablet against the stain; if it goes away, it is organic (i.e. algae); SLAM pool and scrub that area
    - Hold crushed vitamin C tabs in a sock against stain; if it goes away, it is iron; requires a sequestrant to manage metals in the pool; very bad pool s might require an acid wash
    - If vitamin C tabs make a spot get worse, it's copper; a sock full of dry acid may help; or a plaster acid wash for bad areas
    - Calcium stains generally occur because of high CH, coupled with high pH and TA; best removed by adjust CSI levels (lower) and scrubbing the effected area

    Hope that helps.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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  3. Back To Top    #3
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    DFW, TX

    Re: Pool stain identification

    This also seems to be a handy tool for stain ID for 10 bucks, Jacks Magic Stain Identification Kit JMSTAINID at Sunplay

    Here is more info on Diagnosing Pool Plaster Problems
    TFP Moderator
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