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Thread: Negligent chemical reaction! Do I need to change my water?

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    Negligent chemical reaction! Do I need to change my water?

    I'm going to preface this by saying that I'm a dummy. It is actually quite amazing that I've made it to the age of 39 I swear but because of this forum, I've successfully maintained my pool and spa for three seasons now.

    OK, now on to my stupidity. Filled and balanced my spa last weekend and today I tested and it needed a bit more bromine and my pH was a little low. Acid demand test said I need about a half ounce of pH down (93.2% sodium bisulfate). As I measured that out on the scale, I foolishly added a teaspoon of brominating concentrate (82.5% sodium dichloro-s-triazinetrione, 14.7% sodium bromide) on top thinking I'll just add them at the same time.

    I realized my mistake when it reacted quite quickly changing into a red-brown bubbling ooze that smelt quite noxious. Panicking, I threw it into the spa where it seems to have dissipated.

    My questions are, What evil did I unleash? Is it safe to use my spa or do I need to change the water again?

    Thanks so much for any help!

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    JasonLion's Avatar
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    May 2007
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    Re: Negligent chemical reaction! Do I need to change my water?

    Welcome to TFP!

    The spa will be fine. If you are worried about it you can replace the water.

    That reaction was quite dangerous. It releases chlorine gas, which can be deadly. Your quick action might have saved your life.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Casey's Avatar
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    Apr 2007
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    Re: Negligent chemical reaction! Do I need to change my water?

    NEVER EVER mix or add chemicals. Thank God you are ok.

    I hope you learned a valuable lesson. Welcome to TFP.
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

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    Re: Negligent chemical reaction! Do I need to change my water?

    Thanks for the replies, I'm glad to know that the water is still safe. I thought it might have been chlorine gas but it was reddish not green.

    I do feel lucky, that's for sure. I've read on TFP many times to never mix chemicals but I still had that momentary lapse of judgment.

    Maybe my stupidity might prevent some other dummy like myself from ever doing the same thing

  5. Back To Top    #5

    Join Date
    Mar 2007
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    San Rafael, CA USA
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    Re: Negligent chemical reaction! Do I need to change my water?

    The reddish was probably from the bromine that was produced as well. There was more chlorine than bromine, but the bromine is generally a much deeper color than chlorine at the same concentration.
    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
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