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Thread: Cold water and CYA

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    Cold water and CYA

    my CYA came out to about 30, but I tested the water right out of the pool. My thermometer is broken, but the outside temp is about 65 without overnight lows in the 40's. Should i be waiting for the water to get to room temp? If so for just the CYA or all tests?
    new house: TBDK gal IG plaster pool, filter Titan CM DE filter 36 sq ft , 1.5 HP Pump; Polaris 380

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    Re: Cold water and CYA

    The sample needs to be around 70 degrees. I don't believe the other tests are temp sensitive.
    24' round above ground, 13500 gallons, vinyl liner, 18" Sand Filter

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    Re: Cold water and CYA

    Quote Originally Posted by PJ
    The sample needs to be around 70 degrees. I don't believe the other tests are temp sensitive.
    thanks. I'll retest at room temp. would high chlorine have an affect on the readout?
    new house: TBDK gal IG plaster pool, filter Titan CM DE filter 36 sq ft , 1.5 HP Pump; Polaris 380

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    Re: Cold water and CYA

    Not on CYA, but it would on others, if it is high enough.
    24' round above ground, 13500 gallons, vinyl liner, 18" Sand Filter

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    Re: Cold water and CYA

    High chlorine (above 10ppm) affects the pH test but has no significant affect on the other tests.

    Pool temp of around 60 degrees should have very little affect on the CYA test.....certainly within the margin of the test.

    Room temp is best and VERY cold water (say less than 45 degrees) is reported to have some effect.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Cold water and CYA

    Does it make PH read higher or lower?
    new house: TBDK gal IG plaster pool, filter Titan CM DE filter 36 sq ft , 1.5 HP Pump; Polaris 380

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    Mod Squad jblizzle's Avatar
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    Re: Cold water and CYA

    High FC (> 10ppm) makes the pH test read higher than reality {Theoretically, if you read the color very quickly, the pH test is correct, but it drifts up fast as the FC gets higher ... like within a few seconds. So, safest to not trust the test with a FC > 10ppm}
    Jason, TFP Moderator
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    kkendall's Avatar
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    Re: Cold water and CYA

    I've noticed my CYA start to climb over the last few weeks as well. (was about 40 around mid Oct - @ 50 now)
    I know I'm not putting anything in the pool that would cause it to go up, so I just figured it was because the water temp coming down.
    * 18.5 K Gallon, 8ft deep, IG, Pebble Radiance * Pentair VS 3050 Pump w/420 Cartridge Filter
    * Blue Square Q-360 In-floor Cleaning System * UltraPure UPP25 Ozone Generator
    * Pool startup: 09-04-2012 * TF-100 Test Kit

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