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Thread: scale is rough on bare feet

  1. Back To Top    #1

    Join Date
    Apr 2012
    duncan, oklahoma

    scale is rough on bare feet

    I have what I think is calcium deposits on floor and walls of pool. it hurts the grandkids feet like sandpaper to the point where they have to wear swim shoes. I was advised to drain the pool, give it an acid bath and refill. Is this normal for a 2yr old plaster pool. Is there another method to dissolve the calcium? Won't the calcium just come back? I use regular chlorox for chlorine and shock.
    26000 gallons plaster pool, 2yrs old. filled w/well water.
    fc 2
    tc 2
    ph 7.2 (2 gallons of acid p/week to maintain ph balance)
    ta 200 (aerating to try and lower)
    ch 75
    cya 65

    I appreciate any help and advice I could get on removing calcium.
    tom h.
    20k gallons, 36x15 inground plaster with a sand dollar sandfilter, pentair 1.5hp pump

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: scale is rough on bare feet

    With CYA at 65 you want to keep FC between 5 and 10, and never below 5.

    Your high TA, combined with high PH, is the cause of your calcium scaling. If you can keep TA under control, and keep everything else balanced, you won't get any further scaling.

    A drain and manual acid wash is the only reliable way to remove calcium scaling. There are various other approaches you could try, but they take time and often don't work.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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  3. Back To Top    #3
    Melt In The Sun's Avatar
    Join Date
    Oct 2009
    Tucson, AZ

    Re: scale is rough on bare feet

    How did you get those test results? My gut feeling does not believe the calcium number.
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
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  4. Back To Top    #4

    In the Industry

    Join Date
    Jul 2010
    Ashford, CT

    Re: scale is rough on bare feet

    filled w/well water.

    Well water has a lot of minerals and other metals in the water - which will compound your scaling problem. You may have to drain and acid wash, possibly buff/ wet sand to get it smooth and then get filled with city water. Its expensive 1-2K where I live, but is necessary for a plaster pool.
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  5. Back To Top    #5

    Re: scale is rough on bare feet

    I seem to have the same condition in my plaster pool. Last season was our first summer with the pool, and it went well.
    The rough surface seemed to have happened over the winter.

    Is there any way of just using a rougher metal bristle brush to brush off the deposits v.s. draining and doing a acid wash?

  6. Back To Top    #6

    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: scale is rough on bare feet

    Welcome to TFP!

    Yes, you can usually just lower the pH and keep it lower for a time and brush the pool. The scale should redissolve if it's relatively fresh. However, to know if this will work we really need a full set of numbers so that the Calcite Saturation Index can be calculated in The Pool Calculator. You need a proper test kit to be able to get accurate numbers -- either the TFTestkits TF-100 or the Taylor K-2006 where the former has a larger volume of the reagents you use the most so is more economical (see Test Kits Compared).
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
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