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Thread: Testing CH levels in a pool with copper

  1. Back To Top    #1

    Join Date
    Aug 2010
    tallahassee, florida

    Testing CH levels in a pool with copper

    Just tried to test CH in my new pool filled with city water (Copper .668 ppm) with the tft100 test kit, and the pink solution precipitates into slightly purple particles, with the solution becoming almost clear, but will never turn blue. Is this amount of copper causing this test to fail?

    Split from this thread Testing CH levels in a pool with copper
    25k gallon pebble/shotcrete rectangular pool
    vs-svrs pump with pentair s8m500 cartridge filter
    Intellichlor 40 and UPP25 ozonator;2.5" plumbing
    automated security cover- polaris 280 used infrequently
    8 floor returns, 2 wall returns, 3 lion head spout returns
    pool built summer 2010, city water filled Aug 10, 2010

  2. Back To Top    #2

    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: Testing CH levels in a pool with copper

    Yes, it sounds like the metals are interfering. As noted here in the Taylor instructions:
    Metal ions may cause interference; to prevent, add titrant containing EDTA to sample before buffer and indicator, then test as normal making sure to count drops of titrant added initially in total required to reach endpoint. If interference still occurs, dilute sample with DI water as necessary and retest.
    So try adding 5 drops of R-0012 at the start of the test before the R-0010 calcium buffer and R-0011L indicator dye, but be sure and count these 5 drops in your total count.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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