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Thread: Stained plaster

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    Noorm's Avatar
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    Stained plaster

    2002-12-31 23.00.00-14.jpg2002-12-31 23.00.00-10.jpg
    Attached photo's of pool walls after brushing of what I believe to be mustard algae.
    Will these require acid wash to remove?
    In ground concrete/plaster. Re-plastered 5 years ago Approx 30,000 Gal.
    Hayward 2 speed pump and C3030 cartridge filter. Taylor K-2006 test kit

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    Patrick_B's Avatar
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    Re: Stained plaster

    If it is Mustard Algae, Chlorine is the answer. It looks like it could be regular Algae, but in either case a SLAM is in order.
    TFP Moderator
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    Mod Squad pooldv's Avatar
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    Re: Stained plaster

    Time to read up on SLAMing Your Pool
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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

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    Noorm's Avatar
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    Re: Stained plaster

    Quote Originally Posted by pooldv View Post
    Time to read up on SLAMing Your Pool
    Oh, I've read up. Problem is my CYA is so high that the SLAM requires mucho CL, so I'm gonna try the BioActive CYA reducer first. (After I get FC down. LOL. Vicious circle.)
    In ground concrete/plaster. Re-plastered 5 years ago Approx 30,000 Gal.
    Hayward 2 speed pump and C3030 cartridge filter. Taylor K-2006 test kit

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    Mod Squad pooldv's Avatar
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    Re: Stained plaster

    Not interested in buying CL by the truckload eh? Good lucķ!
    TFP Moderator
    If TFP helped you or saved you money - Become a TFP Supporter! <--Click here
    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

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    In the Industry

    duraleigh's Avatar
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    Re: Stained plaster

    Noorm,

    If that's a pic AFTER you brushed the walls, that is probably not any type of algae but rather calcium scale or iron stains.

    You must identify the stain positively before you embark on a plan to get rid of it. Is it rough to the touch?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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