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Thread: Calcium under spa overflow ledge

  1. Back To Top    #1

    Join Date
    Jun 2009
    Vero Beach, FL

    Calcium under spa overflow ledge

    Here are my numbers:

    CL = 10
    pH = 7.5
    TA = 80
    CH = 400
    CYA = 70
    Salt = 4500
    Borates = 50 (approx - based on amount added)
    Pool temp = 84

    Have not had a signigicant problem with calcium buildup until now. Only thing I've added in the past few months is 2 lbs citric acid to clear up some stains caused by iron from a repair job.

    Normally, the spa overflows into the pool. But about 2x a week I let the spa get up to about 100 - 110 degrees and don't let it spill over until the next day. I just noticed a large portion of the tile under the overflow had significant calcium deposits. Its not on any other tile - just under the ledge. Why would I only start seeing this now? I guess it has been a while since I brushed the pool.
    25' x 13' Roman, 12000 gal IGP, Plaster, with 500 gal Spa
    SWG, 1 HP Max Flo Pump, C-900 cartridge filter
    Solar heat

  2. Back To Top    #2

    Re: Calcium under spa overflow ledge

    Drop ph down to 7.0 - 7.2 and it will go back into suspension.

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