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Fresh Water Chlorination

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  • Fresh Water Chlorination

    I have a FW tank with 105 m3 of water with Chlorine content of 0.09 mg/L.

    How much 12.5% sodium hypochlorite solution do I add to raise the level to 0.30 mg/L chlorine.

    I have no idea how to work this out

  • #2
    There seems to be debate about it, and depend on the concentration of chlorine in your sodium hypochlorite, but I worked it out as needing 176.4ml adding.

    Your tank is 105000 L
    Your initial concentration is 9450 mg/L (0.09 x 105000)
    Your required concentration is 31500 mg/L ((0.09 x 105000) / 0.3)
    The required increase is 22050 mg/L (31500 - 9450)
    Assuming the chlorine to be at a concentration of 12.5%, that gives a value of 125000 mg/L

    22050 / 125000 = 0.1764 L
    =176.4 mL

    If the chlorine concentration is 12% (allowing for the sodium etc), then the required amount is 183.75 mL.

    That's my understanding of it, but I'd double check that because I could be completely completely wrong, and I don't want anything to do with a load of people getting sick with over/under chlorinated water!