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Thread: Difference readings with different test kits

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    Join Date
    Jan 2015

    Difference readings with different test kits

    I have a Taylor K-2006 kit that I use for everything except testing Bromine. I bought a Rainbow Lifegard kit that only tests pH and Bromine. When I tested pH using the Taylor and the Rainbow, I got drastically different readings. Taylor read 7.4 and Rainbow read above 8.4. The Bromine readings were also very high. So I bought another brand of Bromine/pH kit (Hydrotools Swimline). That also very high for pH and Bromine. Now I wonder if the Bromine reading is higher than what it actually is. However, I used a Aqua Check strip and also got a high reading. So I'm guessing the Bromine is accurate, but the pH isn't. Have you seen this issue before?

    260 gal., outdoor, cartridge filter, well water.

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    Re: Difference readings with different test kits

    The 2006 is the best kit for all tests. The high bromine level is interfering with the ph test causing it to read high.

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Difference readings with different test kits

    Different PH tests are buffered more or less effectively against chlorine/bromine interference. Taylor uses much more effective buffering, so it will still work at much higher chlorine/bromine levels than the Rainbow kit will.
    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

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