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Thread: Calcium Hardness Changed alot in 2 weeks

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    Calcium Hardness Changed alot in 2 weeks

    Hello,

    My calcium hardness was 140 about 4 weeks ago assuming I performed the test correctly. I have added a few inches of water from my hose since then. We have a well with a water softener. I dis not bypass the softener because I was worried that the straight well water for have metals or something else that would be undesirable.

    My current calcium hardness is now 40.

    Could this have changed that quickly?

    Complete test results

    FC 4.5
    CC .5
    TC 5
    PH 7.6
    TA 80
    CH 40
    CYA 60
    20K gallon Inground Vinyl Liner
    Auto Pilot SWG
    Hayward Pump and DE Filter
    Rheem Heat Pump
    Dolphin Robotic Cleaner
    Pacific Bio Shade Mesh Cover
    TF-100 Test Kit

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    BoDarville's Avatar
    Join Date
    Jun 2012
    Location
    DFW, Texas
    Posts
    3,840

    Re: Calcium Hardness Changed alot in 2 weeks

    Very unlikely that the CH would have changed this much if this was the only water addition since the initial test. Much more likely is that one of the tests was not performed correctly. Here are some Extended Test Kit Directions for testing all water parameters. CH is about halfway down the page.
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
    A good test kit is an investment, not an expense.

  3. Back To Top    #3

    Re: Calcium Hardness Changed alot in 2 weeks

    I just did the test again 3 times and all were 40. I ran the test the first time 3 times also and it was 140. I am confused of what I could of been doing wrong. With a swg and vinyl liner pool should I adjust this up any or just leave it. Thanks for the help.
    20K gallon Inground Vinyl Liner
    Auto Pilot SWG
    Hayward Pump and DE Filter
    Rheem Heat Pump
    Dolphin Robotic Cleaner
    Pacific Bio Shade Mesh Cover
    TF-100 Test Kit

  4. Back To Top    #4
    linen's Avatar
    Join Date
    Jul 2010
    Location
    Twin Cities, MN
    Posts
    8,649

    Re: Calcium Hardness Changed alot in 2 weeks

    I wouldn't worry about a CH of 40 in a vinyl pool (with the caveat that if you have fiberglass steps, as we have had one report of blistering that may or may not have been caused by low calcium and also a very few reports of metal staining exacerbated on steps due to having low CH, though those should be easily removed by local application of vitC if it does occur).

    I am not coming up with a theory as to why your CH changed. Has cya changed?
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

  5. Back To Top    #5

    Re: Calcium Hardness Changed alot in 2 weeks

    I added about a pound of stabilizer a few weeks ago as I am increasing slowly because that test is difficult for me to get consistent results and I am afraid of going too high.
    20K gallon Inground Vinyl Liner
    Auto Pilot SWG
    Hayward Pump and DE Filter
    Rheem Heat Pump
    Dolphin Robotic Cleaner
    Pacific Bio Shade Mesh Cover
    TF-100 Test Kit

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