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Thread: Odd Calcium Hardness Test

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    Join Date
    Jul 2015
    Clearwater, FL

    Odd Calcium Hardness Test

    I tried to test my pool water for calcium hardness today, but instead of getting a color change from red to blue, my testing solution precipitated red flakes into the solution and never turned blue. I tried repeating the tests three times, each with the same result, and for one test I used a newer R-0011L reagent. Any ideas what may be going on?
    16K gallon IG exposed aggregate pool with Aquarite SWG T15 cell, Hayward C1750 filter, EcoStar SP3400VSP pump, H400FD pool/spa heater, Polaris PB4-60 booster pump, 280 pressure cleaner, Hayward Super II spa pump and Air Supply Silencer spa blower

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    In the Industry

    Donldson's Avatar
    Join Date
    Jun 2009
    NW Ohio

    Re: Odd Calcium Hardness Test

    Is there any chance you have copper in your water? What you are describing seems to match what happens when there is copper present. Try following this step and see if that helps the situation:
    NOTE: If the pool water contains known copper, add two drops of R-0012 PRIOR to adding R-0011L and continue. Count the two drops in your R-0012 total.
    JD - 28' Round Above Ground Pool, 17,000 Gallons. Dual speed Jacuzzi pump with cartridge filter. Dual speed 1 HP pump, Hayward S210T sand filter
    Pool School - PoolMath

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