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Thread: Reverse osmosis (ro) systems

  1. #9
    Capslock's Avatar
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    Hmm. I'm not aware of it using more wastewater. The wastewater in an RO unit is water that is washing the RO membrane as it builds up with minerals and impurities. You don't want to use this water on your cps. But you certainly could save it for other uses. Mine just drains into my basement utility sink, though in a drought year I'd probably save it for watering my regular plants.

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  2. #10
    Nepenthes Specialist nepenthes gracilis's Avatar
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    Why would a tank waste more water? I've never heard of that. All a tank does is keep water at hand, provided the unit has an auto shutoff device. If you want a large volume of water, buy a float valve, I have a constant supply of 32 gallons at hand whenever I need it. THe 90GPD unit I have easily refills it overnight (empty), or within an hour if i take out a little water for use.

  3. #11

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    I heard about the pressure the tank creates wasting more water in this thread, second post down. I am not too worried about it, I was just wondering how big a difference it causes. I suppose if I wanted to use the "waste" water, I would need to get another tank/container to store it in.

    Also, do you know if adding a UV filter would help a lot in removing viruses and bacteria, or does this setup do that the way it is?

    Thanks,
    Ben

  4. #12

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    I don't see how a tank system with a shutoff valve could possibly waste more water. My RO unit shuts off as soon as pressure is reached.

    IMO, UV filters are a waste of money unless your source water is known to have biological contaminants.

    Sam

  5. #13
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    The tank may cause more wastewater. Since the tank is pressurized, the system has to work harder to fill the tank. And water will flow to where there is less resistence, the wastewater tube. That's my theory. I collect the wastewater in a bucket and dump it when it's full. I sometimes use the water on non CPs. I tested the wastewater's ppm, it has more TDS than tapwater [img]http://www.**********.com/iB_html/non-cgi/emoticons/new/smile_h_32.gif[/img] If you're concerned about it producing too much wastewater, put a flow restrictor on the wastewater line. You'll need to give the membrane a good flush once a month or too much bad stuff will be collecting on it.
    larry
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  6. #14

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    I'm not overly concerned with wastewater at this point, since I will probably only use 1-2 gallons of water a day. I just would like to optimize it without bringing in other problems.

    If the source water does contain bacteria/other biological contaminants, does this mean that a UV filter is required to remove them? Or will the RO filter them out? I imagine there must be some advantage to UV since all the water dispensers I see at stores claim to use UV. How can I even know if the source water contains biological contaminants?

    I found what seems to be a relatively cheap UV filter here:
    http://cgi.ebay.com/ws....hosting

    I am not planning on getting one now, but I was just thinking about it as a future possibility. Especially if I want to use the water for things other than just plants. I don't know how much plants are affected by bacteria in water.

    By the way, this is the system I ended up getting, after seeing so many recommendations:
    http://cgi.ebay.com/ws....1819204

    I'll try to remember to post the outcome once the filter arrives.

    -Ben

  7. #15
    It's been one of dem days BigCarnivourKid's Avatar
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    Ben, If the RO filter can remove disolved mineral molecules, then bacteria will be removed too. Pushing a bacterial cell through the membrane would be like trying to drive an eighteen wheeler through a 12" diameter culvert. It ain't gonna happen unless the membrane is bad. The only reasons I can think of for needing a UV stage would be 1) Back up in case the membrane goes bad and 2) messing up viruses. Some of which are small enough to get through an RO membrane and UV does a number on the DNA. If a person is on a well they might want a UV/RO unit for that reason. As for why the store units have them, I suspect it has more to do with the idea that UV treated water is more sanitary than just plain RO water.
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  8. #16

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    Ben, UV filters are on grocery store water dispensers for two reasons that I can think of:

    1- Marketing-you feel like they care about your well-being and you buy more from them.

    2- CYA-Just in case there are biological contaminants that get through, they want to cover their booties to make sure it wasn't their water that got their shopper sick.

    Otherwise, if you're on a well and you know your water has, say, coloforms or other germs, it'd be a good reason to put in a UV filter. Your local water company should have a yearly report that you can check out that will have all of the statistics for your local water concerning solids, contaminants and biological contaminants. Most even have websites where you can DL the materials-mine does.

    Sam

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