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Thread: Question on Calcium Hardness with New Plaster Startup

  1. Back To Top    #1

    Join Date
    May 2014
    Houston, TX

    Question on Calcium Hardness with New Plaster Startup

    I had my pool replastered about two weeks ago (May 24). The CH level has varied from 200 to 250 the last two weeks. Today it was 250.
    The plaster contractor gave me startup procedures from the National Plasterers Council (NPC). These procedures say the following: "After the 4th Day-calcium levels should be adjusted slowly over the 28 day period not to exceed 200 ppm." Am I OK to keep the level at 225-250 ppm or do I need to strictly follow the NPC levels? I hate to have to pump water out of the pool already to lower CH after just filling it up.
    Thanks, Tom
    16500 gal IG gunite/white plaster
    DE filter TF-100 Test Kit
    Now using bleach

  2. Back To Top    #2
    Isaac-1's Avatar
    Join Date
    May 2010
    SW Louisiana

    Re: Question on Calcium Hardness with New Plaster Startup

    I would say talk to your contractor as this may be a warranty coverage issue
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
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  3. Back To Top    #3
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Question on Calcium Hardness with New Plaster Startup

    The way I read their instructions, you shouldn't raise CH when it is already 200 or higher. But if it goes higher on it's own that is normally fine. It is not completely clear if that is what they meant or not, but it is the only possibility I can think of that makes any sense.
    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

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