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Thread: Yet another RO unit thread

  1. #105
    Kyle's Avatar
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    Yeah, I don't know. We'll see.

    Now, if I measure the TDS right out of the membrane, I'm reading 4ppm. If I measure at the spigot, with the tank closed, about 19ppm. If I measure at the spigot with the tank open, about 12ppm. That last bit is sort of strange, being I emptied the tank of all of the water from last night (the water which had been through the DI stage) and let it refill with water from today, no DI stage. So the water from the tank SHOULD be the same TDS as the water that comes right from the unit to the spigot. I don't know. It seems my brine ratio has gone up (the permeate output is much slower) so I'm going to go remeasure that and I'll remeasure water right before and after the membrane again.

    We'll get this hammered out, LOL.

    ---------- Post added at 06:50 PM ---------- Previous post was at 06:41 PM ----------

    Before membrane: 63ppm.
    After membrane: 7ppm.

    Still at about a 2.2:1 ratio. Seems that everything is just moving slower than yesterday, the pump even seems to be cycling slower. Maybe I'm imagining it. I need to get to Lowes and get that gauge...

    ---------- Post added at 06:53 PM ---------- Previous post was at 06:50 PM ----------

    Mmmm, might've just pinpointed a possible suspect... directly out of the carbon post filter is 29ppm.

    EDIT: Can I try having the water go straight from the permeate out of the PP to the tank? Bypassing the carbon post filter and DI stages completely?

  2. #106
    Av8tor1's Avatar
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    other then the variance in TDS, the rejection ratio is sounding much better

    not sure why your tds would be doing what its doing, logic dictates an issue with the measurements.... or we could still have some trash purging from the system...

    Sometimes I tell my students it is a case of "FM"
    (freaking magic LOL)

    Ideally, I would hope to see your rejection ratio hit 90% or better and a brine rate closer to 4:1 (which may happen with a little use)

    The carbon post filter is producing "fines", it should clear up and is of no concern... this is characteristic of GAC units,

    bypass for a test if you wish, its main purpose is to remove any VOC that may gassed off by the tank bladder

  3. #107
    Kyle's Avatar
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    Yeah, 89% is pretty close (unless I'm totally calculating that wrong).

    Did you catch that add-on in the post above? About the carbon post filter?

  4. #108
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    yep, and edited reply :-)

  5. #109
    Kyle's Avatar
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    Haha, excellent. By bypassing the post filter, will it leave anything of any harmful nature to plants? I do not intend to use it as drinking water, just for the plants. Also, are those "fines" of any danger to the plants? Or is it just carbon? I can't imagine carbon dust would be dangerous to the plants, but then, I can't imagine it would conduct electricity and register on a TDS meter (isn't that how they work?).

  6. #110
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    shouldnt be an issue either way mate....

    and omg RO/DI makes the best sun tea and coffee

    fresh ground Kona beans and RO/DI :-)

  7. #111
    Kyle's Avatar
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    Alright, I'll try that then. I'll empty out the tank, and route the permeate directly to the tank, no post filtering. See how that goes.

  8. #112
    Kyle's Avatar
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    Some interesting news.

    1) TDS reading on the store-bought distilled water is 0ppm.
    2) Water pressure at the cold water inlet (with system running) is ~80psi.
    3) I bought what I thought was a ball valve (it sure looks like it to me...) except that when a little pressure builds up (and I mean a little, maybe one second's worth of the system running) the little lever part on it used to closed and open the valve pops up and water comes pouring out of it. WTH? So now my system is essentially useless until tomorrow when I can get a real ball valve since I essentially have an open hose on the system. I suppose I could cut a new length of hose to get rid of that... probably will... Ugh.

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