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Thread: Reverse Osmosis

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    Reverse Osmosis

    We had the water from the bore hold on our plot tested a few months back and discovered it contained 200 parts per million of arsenic, the safe level if there is such a thing is 50.

    The public water is only a couple of hundred meters away from our place and we're due to be connected within a 'few months' which could mean up to a year here.

    I'm getting a lot of mixed reports about whether or not it's safe to bath/shower in water with arsenic. As we have young kids and the potential side effects of arsenic are so serious, I'm not going to take any chances, so have decided to fit a reverse osmosis machine and filter all of the water.

    I've found some pretty beefy machines that can process 50+ gallons an hour so the plan is to put all the incoming water through that machine before putting it in the storage tank. It's a bit of a waste as we'll end up flushing treated water down the toilet but I just can't see that a separate storage tank, pump and piping system for treated and untreated water would be a good value proposition, considering that it will likely only be for a year.

    Does anyone have any experience with these machines? They seem pretty cheap to buy at around $500 and then only need the pressure of the water system to operate, do they require much maintenance, filter changes etc?

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    Thailand Expat superman's Avatar
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    Quote Originally Posted by ChrisInCambo
    it contained 200 parts per million of arsenic, the safe level if there is such a thing is 50.
    Shouldn't those figures be 'parts per Billion' ? NRDC: Arsenic in Drinking Water

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    The US Environmental Protection Agency has set the standard for drinking water at .010 parts per million. (10 parts per billion)

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    Quote Originally Posted by superman
    Shouldn't those figures be 'parts per Billion' ? NRDC: Arsenic in Drinking Water
    Yes that was a typo, should be billion.

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    CinC said: "I've found some pretty beefy machines that can process 50+ gallons an hour." Could you name with images a machine or two? Could prove helpful to many of us as there is more than arsenic below ground given that even in cities' sewage is flushed into cisterns that are often cracked: Better safe than sorry. Cheers....

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    You'll have to excuse the 'unique' web design from the Cambodian distributor, but you get the idea - HENG ASIA

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    Quote Originally Posted by ChrisInCambo
    I'm getting a lot of mixed reports about whether or not it's safe to bath/shower in water with arsenic. As we have young kids and the potential side effects of arsenic are so serious, I'm not going to take any chances, so have decided to fit a reverse osmosis machine and filter all of the water.
    What about bathing/showering, or other uses?

    Unless your arsenic level is over 500 ppb , showering, bathing and other household uses are safe. Arsenic is not easily absorbed through the skin and does not evaporate into the air.
    should be no problem

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    I've read that same quote, but then in other articles published by local government in the US it says this:

    Unless your arsenic level is over 50 ppb, showering, bathing, and other household uses are safe. Arsenic is not easily absorbed through intact skin and does not evaporate into the air.
    Our level is 200!

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    Then Mass.Gov says this:

    What about bathing/showering, or other uses?

    Unless your arsenic level is over 500 ppb , showering, bathing and other household uses are safe. Arsenic is not easily absorbed through the skin and does not evaporate into the air.
    Talk about inconsistent messages!

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    Quote Originally Posted by ChrisInCambo
    do they require much maintenance
    A fair amount depending on water source quality. Pre and post filters will need to be replaced at around 12 months. Membrane replacement every couple of years.

    I would not use one for all water in house. Look into a small under sink unit for drinking and cooking. Initial cost and maintenance will be much cheaper.

    If there is a quality bottled water supplier near you I would opt for it and forget the filters.
    Whenever you find yourself on the side of the majority, it is time to pause and reflect.

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    Quote Originally Posted by ChrisInCambo
    Talk about inconsistent messages!
    Appears one of these sources has added or dropped a zero.

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    ^^ Thanks for the advice, drinking water is not problem, we can easily get that delivered. It's more the showering that I'm worried about as the messages are inconsistent. I've read 50 one place, 300 another and 500 at quite a few. With young kids I need to be sure.

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    Sorry to be a doom forecaster Chris but bottled water seems to be no better than tap water. Okay this may be an American thing but I'd imagine Thailand to be worse. BOTTLED WATER NO SAFER THAN TAP? - Free Online Library

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    Quote Originally Posted by ChrisInCambo
    Does anyone have any experience with these machines? They seem pretty cheap to buy at around $500 and then only need the pressure of the water system to operate, do they require much maintenance, filter changes etc?
    need to drop me a link to what you are talking about here ,

    water makers on vessels utilise reverse osmosis and there are extermely high pressures involved and pre filtering of the water to be treated is a must as the membrains involved are very delicate and expensive .

    I'm exteremly doutful of RO that only need the pressure of the water system to operate .

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    Quote Originally Posted by Mid
    I'm exteremly doutful of RO that only need the pressure of the water system to operate .


    We have one for treatment of the water for a fishtank and for ironing as our water contains a lot of calcium carbonate. They work ok. And I would trust my own RO water more than the bottled water. We have a water pressure of app. 3 bar.

    However for every liter of RO water 3 or 5 liters get wasted. I believe with high pressure devices the ratio gets much better. So if your input water is free as in from your own well or you treat only a small part of your water you are ok with them. Also you can use the waste water for watering your garden. But I don't know if your vegetables would accumulate the arsenic.

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    Quote Originally Posted by superman
    BOTTLED WATER NO SAFER THAN TAP? - Free Online Library
    probably true, as tap water is pretty safe normally

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