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Thread: Stains on pool floor

  1. Back To Top    #1

    Join Date
    Jul 2016

    Stains on pool floor

    fifteen year old 16 k gal gunnite pool S Louisiana no major problems over years since Katrina when had to empty / refill. have spots on pool floor which are not of black algae origin. Have submerged self long enough to scrap the spot surface and unlike upsetting b. algae spots the 1 inch diameter dark spots do not budge. Difficult to see from distance only when standing above in pool. Do these sound like permanent stains?
    Blue haven kidney style 16,000 gal gunnite including Spa, test Kit TF - 100
    Built 2000 deep end 7.5 feet, 2 steps at shallow end
    Original SWG then convert to chlorine
    Pentair Clean & Clear cartridge filter (4)
    Blue Haven Teledyne Laars Platinum II heater

  2. Back To Top    #2
    Mod Squad
    Join Date
    Aug 2012
    DFW, TX

    Re: Stains on pool floor

    Rub a trichlor pucks on one for 5 or 10 minutes. Then rub or let a Vit C tablets on one for 15min to a few hours.

    If trichlor works it is organic, if Vit C works it is metal.
    TFP Moderator
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

  3. Back To Top    #3

    In the Industry

    Join Date
    Apr 2015
    tucson, arizona

    Re: Stains on pool floor

    Could be rebar bleeding through. Sometimes when it is really close to surface you will start to see rust around spots. Many times it will just be black and continue to get larger over time

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