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Thread: Vinyl pool and calcium hardness

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    Join Date
    May 2008
    Location
    Northern Virginia
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    30

    Vinyl pool and calcium hardness

    I was at the pool store returning some over-priced parts and had them test the water. Calcium hardness was 130 and they recommended adding 28 pounds of Hardness Plus.

    Based on what I've read here, it was my impression that I didn't need to worry about the calcium hardness level since I have a vinyl pool. When I told this to the tester, he said he had never heard any such advice. According to him, if the calcium level is low, the water will basically suck calcium out of the liner and cause it to degrade faster.

    When I googled the issue, I saw somebody post the following on another site in response to a similar question:
    "Ignore Calcium Hardness In Vinyl Pools"

    WRONG!!!!!!!!
    I have been in the pool business most of my life... 40+ years... Part of balancing the water daily thru weekly includes Calcium Hardness... If the level is too low it will try sucking it out of the liner! I assume you have never seen a shribbled liner or decayed equipment from not caring about the Calcium Hardness...

    True on the part with concrete, gunite, tile surfaces... Pool builders neglect to tell gunite pool owners to brush the walls a solid 14 days so it doesn't get prickly, etc... Plus to test the water daily, too...

    Note: Always have the pool's water tested professionally for everything when 1st opened and adjust what's off... Then test it again professionally a week later to be sure it is balanced...

    Note: The type of chlorination and added water will dictate if the Calcium Hardness is being effected, too...

    Note: Pool equipment and pool surfaces are eaten away and break down from neglect and poor water balancing!
    Any thoughts on this? A guess is we probably have 2-3 years left on the liner. Maybe more. But I'd sure hate to do anything to rush it.

    I tested chlorine and PH this morning, but here are the rest of the pool store test results. PH was about the same as me. I would have put it at 7.5, but I tested about 8 hours earlier. My chlorine level with the Taylor kit was also higher, but it was sunny, in the 90s and kids spent about 5 hours swimming today so it probably dropped.

    Store test #s:

    Free chlorine: 2.0
    PH: 7.6 (I'm going to try and drop it a bit tomorrow)
    TA: 80
    CH: 130 (they recommended 200-400)
    CYA: 50

    Thoughts?
    _______
    35,000 IG vinyl with new Hayward Sand filter in 2006, chlorinator, Hayward 1.5HP Super Pump, Polaris with own pump, gas heater, 2 skimmers, 2 returns, no main drain.

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

    Re: Vinyl pool and calcium hardness

    You do need to worry about calcium being too high. Of course you are no where near that right now.

    You do not need to worry about calcium being too low, particularly if your current CH level is 130.

    Bad things do sometimes happen to vinyl liners, mostly from the PH being too low, but not because of low calcium.
    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

  3. Back To Top    #3

    Join Date
    May 2008
    Location
    Northern Virginia
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    Re: Vinyl pool and calcium hardness

    At CGT Pool Liners (http://www.cgtpoolliners.com/cgt-techni ... r-care.htm), I saw this advice:

    Calcium levels should be kept at a minimum level of 200 ppm to avoid corrosive conditions. Calcium levels over 500 ppm may cause problems such as cloudy water or scaling on the liner surface.
    I'm not looking to waste money. But I am seeing conflicting advice here. And this one came from a manufacturer, not the guys looking to sell me product.
    _______
    35,000 IG vinyl with new Hayward Sand filter in 2006, chlorinator, Hayward 1.5HP Super Pump, Polaris with own pump, gas heater, 2 skimmers, 2 returns, no main drain.

  4. Back To Top    #4

    Join Date
    Jul 2007
    Location
    Brisbane, Australia
    Posts
    874

    Re: Vinyl pool and calcium hardness

    I don't think there is any calcium in pool liner at all.
    Although they do use calcium carbonate additives sometimes to make poly more durable, it's normally for rigid items.

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