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  1. #1
    euston has flown

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    Website with realtime monitoring of bangkok's tap water quality

    The metropolitan water authority provide this website that displays water turbidity and free chlorine levels for drinking water in real time at the various pints in their distribution network.

    REALTIME Water Quality

    The chlorine levels are effectually given as mass parts per million.

    A word of warning to people using Reverse Osmosis filters to clean their drinking water. Most of these RO filters are damaged by exposure to more the 0.1ppm of free chlorine . You will see from the website that bangkok's drinking water exceeds this in many places by an order of magnitude; not surprising given they are adding extra chlorine to the water at the moment.

    Your filter will probably come with two charcoal filters, whose job is to protect the RO film from this chlorine. If you haven't replaced these for a long time, it might be worth considering. If you can smell chlorine in the filter's waste water..... then you really need to do this.
    Last edited by hazz; 04-11-2011 at 08:34 PM.

  2. #2
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    Quote Originally Posted by hazz
    Most of these RO filters are damaged by exposure to more the 0.1ppm of free chlorine .
    Yes, but when they are damaged by this, the reverse osmosis machines generally stop working - ours has anyway

  3. #3
    Thailand Expat
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    Quote Originally Posted by hazz View Post
    The metropolitan water authority provide this website that displays water turbidity and free chlorine levels for drinking water in real time at the various pints in their distribution network.

    REALTIME Water Quality

    The chlorine levels are effectually given as mass parts per million.

    A word of warning to people using Reverse Osmosis filters to clean their drinking water. Most of these RO filters are damaged by exposure to more the 0.1ppm of free chlorine . You will see from the website that bangkok's drinking water exceeds this in many places by an order of magnitude; not surprising given they are adding extra chlorine to the water at the moment.

    Your filter will probably come with two charcoal filters, whose job is to protect the RO film from this chlorine. If you haven't replaced these for a long time, it might be worth considering. If you can smell chlorine in the filter's waste water..... then you really need to do this.
    Excellent link thanks.
    Last edited by OhOh; 05-11-2011 at 07:41 AM.

  4. #4
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    Turbidity

    "Drinking water standards
    Governments have set standards on the allowable turbidity in drinking water. In the United States, systems that use conventional or direct filtration methods turbidity cannot be higher than 1.0 nephelometric turbidity units (NTU) at the plant outlet and all samples for turbidity must be less than or equal to 0.3 NTU for at least 95 percent of the samples in any month. Systems that use filtration other than the conventional or direct filtration must follow state limits, which must include turbidity at no time exceeding 5 NTU. Many drinking water utilities strive to achieve levels as low as 0.1 NTU.[8]"

    Seems that a value of approx 1.0 is an acceptable one.for Turbidity(cloudiness)

    Free Chlorine

    "Typically water companies keep the level of residual disinfectant in the form of free or combined chlorine
    to 0.5 mg/l or less"
    Last edited by OhOh; 05-11-2011 at 07:42 AM.
    A tray full of GOLD is not worth a moment in time.

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