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Thread: Grout Dark Stain

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    Join Date
    Mar 2015
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    Grout Dark Stain

    Some dark spot started to show up on the grout above the water line. Any clue?
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    12K gallons, IG, Durazzo, Pentair cartridge filter, Jandy ePump JEP2.0 VSP , Pool started March 2, 2015, South FL

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    Mod Squad kimkats's Avatar
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    Re: Grout Dark Stain

    What do your water levels look like? FC, etc? How do you test and treat your pool on a daily, weekly bases?

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: Grout Dark Stain

    I test chlorine and ph daily, the rest mosthly weekly

    PH - 7.5
    FC - 4
    CC - 0
    CH - 375
    TA - 80
    CYA - 70
    12K gallons, IG, Durazzo, Pentair cartridge filter, Jandy ePump JEP2.0 VSP , Pool started March 2, 2015, South FL

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    Defgufman's Avatar
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    Re: Grout Dark Stain

    Are you running the Nature 2 in your signature? It could be metals splashing. It also could be mold or algae if you are not brushing regularly. Last, I would keep the FC higher with a cya of 70. I'd target 7 to 8.
    Inground 13,200 gal Vinyl, Pentair 3/4 hp pump, Pentair Sand Dollar filter, Polaris 280

    Pool School, Pool Math, CYA to FC ratio chart, Testing Kits

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    Mod Squad kimkats's Avatar
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    Re: Grout Dark Stain

    If you look at this chart you are below the min. FC for your CYA.

    Pool School - Chlorine / CYA Chart

    Do you have an pucks? Try rubbing one on the dark spot and see what happens.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Join Date
    Mar 2015
    Location
    South Florida
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    43

    Re: Grout Dark Stain

    I only used the Nature 2 with the initial cartridge for about 3 month. I brush once a week. I have tried spraying regular bleach and brush locally, but not change. I will increase chlorine just in case.
    12K gallons, IG, Durazzo, Pentair cartridge filter, Jandy ePump JEP2.0 VSP , Pool started March 2, 2015, South FL

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