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Thread: Calcium level steep drop?

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    Chewbubba's Avatar
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    Jun 2012
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    Calcium level steep drop?

    As you can see in my sig, I have a vinyl above-ground pool, so I don't test the calcium hardness very often.

    Back on July 8th, it was 110. I didn't test it again until the 20th, a couple of days after I had SLAMmed my pool. I only registered 20.

    I haven't drained the pool or replaced a lot of water either. I figured "eh, you screwed up the test. Get it right next time."

    Today was "next time", and I got 20 again.

    Should I be concerned, or is this a "non-issue" since it's a vinyl pool?
    16x48 Intex Ultraframe vinyl AGP, 2150 gph sand filter/pump (Intex SF70110), Hayward Skimmer, TF-100 test kit

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    Patrick_B's Avatar
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    Re: Calcium level steep drop?

    Non issue, but there is likely some test error somewhere if you got 110 before. The only other explanation is that your fill water changed, and you replaced more of the old than you thought. The SLAM did nothing to your calcium level.
    TFP Moderator
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    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

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    duraleigh's Avatar
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    Re: Calcium level steep drop?

    +1 what brushpup said.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Chewbubba's Avatar
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    Re: Calcium level steep drop?

    The only fill water replaced is during vacuuming, 'cause I have that cheapo vacuum that uses the water hose, but that wouldn't cause that much of a drop.

    I didn't consider that my first reading was off (duh! should have been obvious!). That is probably the case. I already thought I did my FC wrong that same day (been keeping up with it on a spreadsheet). Must have been a bad day for testing. I thought 110 was high for tap water, but hey, what do I know...

    Anyway, if it's a non-issue, then I'm not going to worry about adjusting the calcium.

    Thanks again peeps!
    16x48 Intex Ultraframe vinyl AGP, 2150 gph sand filter/pump (Intex SF70110), Hayward Skimmer, TF-100 test kit

  5. Back To Top    #5
    Patrick_B's Avatar
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    Re: Calcium level steep drop?

    As far as pool water is concerned, there is little that would make me happier than 110 CH. Try 710 on for size and see how you like it.
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

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