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Thread: High CH - lower now or wait?

  1. Back To Top    #1

    Join Date
    Jun 2009
    Location
    Vero Beach, FL
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    462

    High CH - lower now or wait?

    My pool is a few months old and the CH has been steadily increasing - probably due to the new plaster - right? Anyway, it seems to have settled at 420. Assuming it will eventually stop curing, what else can make CH rise?

    Using the poolcalculator, my CSI is -.2, so I'm still in the safe zone.
    Should I replace water immediately to lower CH, or can I wait for evaporation and rains to naturally replace it?
    25' x 13' Roman, 12000 gal IGP, Plaster, with 500 gal Spa
    SWG, 1 HP Max Flo Pump, C-900 cartridge filter
    Solar heat

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    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
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    9,928

    Re: High CH - lower now or wait?

    Fill water is another source of calcium. Also, evaporation and rain will not remove calcium unless it rains so much that you get some overflow. Calcium stays behind when water evaporates.

    As for replacing the water, if it is pretty stable, then I wouldn't mess with it. 420 ppm is not that high. After a season, my CH goes to 600-800 ppm due to high CH fill water.

    It would be a good idea to test your fill water to see if you will be adding any calcium that way. If it is pretty low, they you should be ok for a while.
    Mark
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

  3. Back To Top    #3

    Join Date
    Jun 2009
    Location
    Vero Beach, FL
    Posts
    462

    Re: High CH - lower now or wait?

    Thanks Mark.

    My fill water is low. Can't remember the number now, but less than 180.

    I knew CH does not evaporate - don't know what I was thinking. I will wait untl a good heavy rain and retest.
    25' x 13' Roman, 12000 gal IGP, Plaster, with 500 gal Spa
    SWG, 1 HP Max Flo Pump, C-900 cartridge filter
    Solar heat

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