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Thread: Stamped concrete bleached under where pool cover was

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    Stamped concrete bleached under where pool cover was

    I don't see a topic specific to pool decks, so I'm posting it here to see if anyone can help me out.

    So when we took the cover off the pool last week, the stamped concrete underneath where the pool cover was is bleached (see photo). At first I thought the rest of the pool deck was just dirty, but I power washed it and that didn't help. Any ideas? Thanks in advance!

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    20k gallons
    In ground plaster pool
    Pentair C420 filter, Pentair Whisperflow 2hp

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    cowboycasey's Avatar
    Join Date
    Jul 2013
    Fletcher, OK

    Re: Stamped concrete bleached under where pool cover was

    while it does look bleached I think it is just the opposite, the sun has darkened the rest of the deck and did not get under the cover..
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    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: Stamped concrete bleached under where pool cover was

    I suspect Cowboy Casey may be right. Mix up a little Muriatic Acid about 1:8 and find a spot on the patio that isn't too noticeable and sprinkle some on, It'll fizz. Hose it off right away. After it's dry, see if it matches the pool border. If yes, your weekend will be spent with a deck brush and a spray bottle of acid.
    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.
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    Join Date
    Apr 2009
    Central Minnesota

    Re: Stamped concrete bleached under where pool cover was

    The concrete under my safety cover is much lighter. Inspecting the concrete closely, the concrete under the cover is clean and has no dark algae. The exposed concrete in the yard and driveway has a small amount of black algae on it, hence making it slightly darker. Also noticed the concrete is lighter under the spots where we park our cars. I've cleaned the concrete by hosing it down with water, pouring some bleach on it, and scrubbing lightly with a nylon bristle push broom. Be careful to not get any on your plantings.
    18' X 36' X 4.5' vinyl oval in-ground 17K gallons, 250K BTU Pentair Master Temp NG heater, 1HP Hayward Super Pump, Hayward S200 sand filter, Hayward Pool Vac, Extreme mesh safety cover, TF-100 test kit.

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    Re: Stamped concrete bleached under where pool cover was

    Thanks a lot for your replies, guys. I'll give that a try & let you know how it goes!

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