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Thread: Source of Calcium

  1. Back To Top    #1

    Join Date
    Jul 2011
    Location
    Austin, TX
    Posts
    60

    Source of Calcium

    I am posting this on behalf of a friend who just purchased a house down the road which came with a pool. I have tested the water several times, and everything appears to be close, except for the calcium (CH=700). Using Poolmath, he will have to replace 2/3 of his pool water with municipal water to get it to 350. Here's my question: what are the various sources of CH? I only know of two sources: fill water (150 in my area) & PS Pool shock. We have the same water source, and I tested both his pool and tap water.

    I have told him that a partial drain/fill is needed, but I'd like to isolate the source so he's not doing it more than once.

    Here's the specs on the pool/tests. Please ignore the information in my sig.

    Pool
    10,000 gallons
    Plaster
    SWG
    DE

    FC=10
    CC=0
    pH=7.7
    CYA=80
    TA=80
    CH=700+
    Salt=3,500
    16,000g in-ground plaster pool, attached spa, BBB, DE Filter, SWG

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Source of Calcium

    The CH almost certainly came from the fill water. As water evaporates, the CH stays in the pool. Then when you add water to top off the pool you are adding more CH. Over time the CH level goes up.
    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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