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Thread: Calcium

  1. Back To Top    #1

    Join Date
    Aug 2013
    Stockton, Ca.


    TC 14 (FC 14 CC 0)
    pH 7.5
    Calcium 11
    CYA 85

    Here's my question: When I did my calcium test it came up pink. Then it took 11 drops to turn it back to Light purple.
    Is this test valid? How do I determine if I need calcium?
    Chris M. 20k, inground, defilter, pebbletek, 1hp motor,Tiger Shark QC, TF-100, switched to liquid chlorine 3 years ago LOOOOVVVVEEEE it!

  2. Back To Top    #2
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: Calcium

    Did the color stop changing at purple with more drops added? You need to continue to add drops until the last one does not cause a color change (and it does not count).

    How much water did you use in the CH test? 25ml or 10ml? That determines the multiplier for the drops.
    10ml water sample makes each drop 25ppm ... so your CH would be 275ppm (likely higher as I am not sure you finished)
    25ml water sample makes each drop 10ppm ... so your CH would be 110ppm (likely higher as I am not sure you finished)
    Jason, TFP Moderator
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  3. Back To Top    #3
    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: Calcium

    The CH test will go to sky blue when it's done. Lavendar is close, but not there yet. Question: how big was the sample? 10 ml or 25 ml?

    I'd say you need to rerun the test.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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