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Thread: calcium scale and acid wash (empty pool)

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    calcium scale and acid wash (empty pool)

    I had a problem with calcium scale last year, but also had a problem with the glazing on my tile chipping so i decided to do an acid wash this year. I have a 20K gunite/plaster pool that is 4 years old.

    I have a feeling the scaling was due to my high pH as the CH seemed to be fine - but no matter - I will get the water chemistry right when i fill it.

    My question is this - I am acid washing with a 50/50 water/acid solution, and although the plaster looks very nice, I still feel the sharp - rough calcium. A pumice stone takes it off, but I don't really like the idea of rubbing the entire pool down.

    I have already made 2 passes with acid wash. I am using a watering can - pouring it on, letting it sit for about 30 seconds and scrubbing and rinsing.... Should I up the concentration of acid? Any other thoughts?

    I know I could do the no-drain method, but I don't have a heater bypass, and to put one in, I need to get some new union connectors for the filter and heater... just more work.

    If this thread is in the wrong forum, feel free to move.


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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: calcium scale and acid wash (empty pool)

    You are doing the right thing. However, if the scale is thicker than normal, it can take a couple of passes to get all of the scale off.

    You can use more concentrated acid, but it is rather more difficult to work with and I don't really recommend it.
    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

  3. Back To Top    #3

    Re: calcium scale and acid wash (empty pool)

    Thanks, it sounds like I could make my mixture stronger... yeah, I don't really want to buy stronger acid - and if I recall, to get the stronger stuff you had to buy a carboy.

    I guess I will try 75% acid to water, and I could always try a small spot at full strength.

    Thanks for the feedback.

  4. Back To Top    #4

    Join Date
    Sep 2014
    Bakersfield, CA

    Re: calcium scale and acid wash (empty pool)

    I guess it all depends on the strength of the acid you start with. My local Home Depot has 14% and 31%. Diluting both of these to 50% will give you vastly different strengths!
    Cheers, Peter
    20,000 gal, 52'x17' kidney shaped IG, Pebble Tec, IntelliPro P6E6VS4H-209L pump. Intellichlor IC40 SWG.
    300 sf Sta-Rite System 3 cartridge filter. Poolvergnuegen 4-wheel suction pool cleaner. TF-100 test kit.

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