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Thread: Powdery white substance alloevr pool walls

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    Join Date
    Aug 2014
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    Powdery white substance alloevr pool walls

    20150319_102449.jpg20150319_102443.jpgWe gunited in December and are now waiting for the weather to warmup for the PB to continue with our build. But I have noticed a white powdery substance (see pictures) all over the walls of the pool. Although we have had a lot of snow, it does not appear to be remnants of any snow. Does anyone know what this is, and whether I should be concerned?

    Thanks
    1200 Sq Ft 41,000 Gal. Gunite, JANDY SVRS VS pump, JANDY JXI 400,000 BTU, Polaris 280 w/ 3/4 BP, Rockwall and Grotto (w/6 jets and blower), 2 JANDY Lam Jets, 2 LED Bubblers, 5 Ledlights, AQUALINK P16 RS, 90% Quartz, SWF 185 GMP BP, SWF 125 BP, Levelor K1100 Autofill, AP Digital SWG, 2 skim and 5 returns, and mostly 3 inch piping

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    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    Re: Powdery white substance alloevr pool walls

    On bare gunite, before plastering, that is common enough and nothing to worry about. It is called efflorescence and comes from minerals being pushed through the gunite by ground water. Once plastered you won't see it, and since the plaster is waterproof no new efflorescence will form.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Join Date
    Aug 2014
    Location
    NJ
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    426

    Re: Powdery white substance all over pool walls

    Thanks
    1200 Sq Ft 41,000 Gal. Gunite, JANDY SVRS VS pump, JANDY JXI 400,000 BTU, Polaris 280 w/ 3/4 BP, Rockwall and Grotto (w/6 jets and blower), 2 JANDY Lam Jets, 2 LED Bubblers, 5 Ledlights, AQUALINK P16 RS, 90% Quartz, SWF 185 GMP BP, SWF 125 BP, Levelor K1100 Autofill, AP Digital SWG, 2 skim and 5 returns, and mostly 3 inch piping

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