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Thread: How to test the chlorine in the bottle

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    Kathyonthefarm's Avatar
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    How to test the chlorine in the bottle

    Good morning,
    I had my pool perfectly balanced then left for vacation after the 4th and the person who was supposed to take of it couldn't. We shocked with the same amount, when we returned and used in the Spring with no show of Cl the next morning. Bought new Cl, 12% bleach, and added, again the same amount used in the Spring and according to pool.calculator., with no show of Cl, again. Could the bleach in the bottles sold to us be old? How can I test the cl in the bottle?
    Thanks,
    Kathy

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    Marillion Fan's Avatar
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    Re: How to test the chlorine in the bottle

    I would lean towards something consuming the chlorine overnight, you should post a full set of water test result numbers so everyone can try and help explain your situation.
    Also having your pool dimensions listed in your signature will help determine how much of what will be needed to clear up your pool.
    18x33 15700 Gal Oval Above Ground
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    Kathyonthefarm's Avatar
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    Re: How to test the chlorine in the bottle

    Could the bleach concentrate be bad that we are using? How can I check this? I want to rule out the conentrated level I am using.
    Thanks,
    Kathy

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    reebok's Avatar
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    Re: How to test the chlorine in the bottle

    I agree with marillion. if you want you can read these and see if you can figure out how to do it. it's not easy and is mostly a waste of time imho.

    testing-bleach-for-chlorine-concentration-t14555.html

    commercial-bleach-testing-concentration-t10789.html
    16x32 21,000 gallon in-ground exposed aggregate, 1.5hp pump, 120 sqft catridge filter, birdcage, solar panels, aquavac tigershark qc robot.

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    frustratedpoolmom's Avatar
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    Re: How to test the chlorine in the bottle

    I'm voting organics consuming it quickly.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
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    Re: How to test the chlorine in the bottle

    The dilutions required to test chlorine strength are surprisingly difficult because it requires such a tiny, tiny amount of chlorine. It's normally too difficult to do.

    However, you could simply take a dropper and drop some into a glass and test for the presence of chlorine using an OTO test......it'll tell you it's not zero but that's about it.

    EDIT - It's probably organics in your pool but we are all just guessing without test results.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Kathyonthefarm's Avatar
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    Re: How to test the chlorine in the bottle

    Ok people, I don’t want to sound stupid or that I know more than anyone but……………I took a small amount, 1 tablespoon or so and dumped into water ( quart size) with no cl and got NO reading………………..shouldn’t I have got some reading?……….I do know the pool store did not know how old the cl was ……….I also used the test strips from a neighbor and dipped it directly into the bottle of the cl and got a reading of 1……..so are these samples/tests valid enough to take the cl back to the store? Or to assume the cl is old with no cl in it? I am using a Taylor kit with new reagents this May and have been using, recording and measuring pool info all season with no problems. I think I was sold old cl with NOOOOOOO cl in it.

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    Re: How to test the chlorine in the bottle

    Quote Originally Posted by Kathyonthefarm
    ...I took a small amount, 1 tablespoon or so and dumped into water ( quart size) with no cl and got NO reading………………..shouldn’t I have got some reading?……….I do know the pool store did not know how old the cl was ……….I also used the test strips from a neighbor and dipped it directly into the bottle of the cl and got a reading of 1……....
    It sounds like you proved that you got a bum batch of chlorine. I would take it back and let them test it for themselves to prove it to them. If you have some Clorox in the house - you could test that also to prove that your chemicals and test strips aren't bad. Good luck
    25000 gal inground freeform plaster pool with spillover hot tub. 1.5 hp PacFab Challenger pump, Hayward DE filter, Natural Gas heater, BBB convert 2009, Aquasol solar panels on ground rack 2010, PS-4 controller 2010, Rocky roller, SWG 2011.

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    JasonLion's Avatar
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    Re: How to test the chlorine in the bottle

    If you used an OTO chlorine test, then the chlorine is bad. But if you used a DPD or FAS-DPD chlorine test, then you really haven't found out anything. Both the DPD and FAS-DPD tests will bleach out and read zero at extremely high FC levels. DPD bleaches out fairly easily, and FAS-DPD will also bleach out if the FC level is extremely high, as it would have been with the procedure you described.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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