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Thread: Calcium carbonate nodule

  1. Back To Top    #1

    Join Date
    Dec 2014
    San Diego CA

    Post Calcium carbonate nodule

    pool and spa combo spa has calcium nodules all over in spa they are little . pool and spa got refinished about 1 year ago. the ph has been good 1or2 times ph was at 8. hardness in water is at 450 . is there something that i have done our company that refinished the pool and spa

  2. Back To Top    #2

    Join Date
    Sep 2013

    Re: Calcium carbonate nodule

    Can you post a full set of test results?

    Also, your final sentence seems incomplete -- what were you trying to convey?
    18' x 48" ring top pool (Summer Escapes); 5500 gallons; set up June - October, stored during winter; Intex 2500 gph pump (B size cartridge filter) Hayward 21" sand filter + 1.5 hp single speed Powerflo Matrix pump (upgrade October 2016) *** K-2006 test kit, refills from tftestkits

  3. Back To Top    #3
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: Calcium carbonate nodule

    Welcome to TFP!!!

    Sounds like you were letting the pH stay too high for too long and now you have calcium scaling.
    Who maintains the chemistry? How often?
    How often are you testing? With what test kit?
    Jason, TFP Moderator
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  4. Back To Top    #4

    Join Date
    Jul 2011
    Arizona & California

    Re: Calcium carbonate nodule

    The spa may have calcium scaling issues as mentioned above, but it also could be a delamination/cracking problem where a white calcium nodule forms.
    A pH of 8.0 does not normally or necessarily cause scaling. Are the nodules random or like very rough sandpaper?
    If you could post a picture or two, and the complete water test results, it may help us to determine what the problem is.

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