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Thread: R/O Unit Problems

  1. #41
    Av8tor1's Avatar
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    Chrono, as far as i know it shouldnt pulse, the only ones that will pulse are those equipped with a permeate pump... which yours doesnt have

    have you confirmed the ASO hookups?

    and your output should be zero ppm or close to it with a DI equipped system

    lets go back and take the tds measurements again, do all the same test points

    inlet

    outlet from prefilter
    '
    inlet to membrane

    outlet from membrane

    inlet to DI

    outlet from DI

    waste water

    and now we need to check pressure at the membrane inlet with output flow at max

    and we need to know brine rate now to verify restrictor adjustment


    Ill be honest chrono, if you get out of this without replacing the membrane and/or beads you'll be lucky... but you will know RO inside and out, it is an investment that you will probably get use from for many years... so in the long run the education you have gained is at least an unintentional benefit, I know that doesnt help a whole hellva lot at the moment

    but lets not jump to that yet... not without the numbers

    BTW, I have an extra quart of beads Ill donate to the cause if you need them

    Av

  2. #42
    ChronoKiento's Avatar
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    Well I had originally thought that the DI beads were already all used up, but when I drained the water from the capsule.. half of them still had their original color. So they should still be of use for the time being.

    I think before I start taking those TDS measurements again, I need to deal with another issue. Since readjusting the flow restricter, the unit has yet to produce anymore than a couple dribbles of water.. so I decided to restrict the flow a bit more to see if it fixes that problem. I should know by tomorrow morning.. then I will take those readings again. Since I have to work tomorrow I may not be able to get them then, but Thursday I will. I also ordered a better restricter that just has two settings.. flush and restricted.. nice and simple. (I's the one you recommended, Andy. It was rated for 75-100GPD, I left a note in my payment saying that I need it to be for 100 GPD membranes so I'm not worried about that.)

    Oh and about the bursts of water. I think that was just a side effect of the system rebuilding pressure after the DI capsule was emptied. I'm thinking of just shutting down the system until the new flow restricter arrives.

    It seems like no matter what setting I put the restricter on, it still won't give me any more than a small spritz of water which still gives me a 48ppm reading.
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  3. #43
    Av8tor1's Avatar
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    okie dokie,

    FWIW you should be able to tell if the flow restrictor is sized correctly by checking the pressure on the inlet of the membrane, assuming your system inlet pressure is about right the inlet to the membrane should be at least 40psi... as you open and close your adjustable flow restrictor you should see this pressure increase and decrease. Proper setting would be at least 40psi, then once you have this pressure set you can check brine rate/rejection ratio and determine for sure if your membrane is shot

    the point of the adjustable flow restrictor is the ability to increase this backpressure as the membrane ages, which is actually kind of nice but it sure does complicate the installation process

    Av

  4. #44
    ChronoKiento's Avatar
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    Well when I finally get my pressure gauge hooked up.. I'll be sure to check for 40 psi. Does that mean I should put the pressure gauge right before the membrane?

    Andy, I got a reply from Aqua-Safe tech support from that email you wrote up for me. It just says this...

    "Hi this is not enough to analyze the problem...try screwing the variable flow resister in more...ed"

    Awesome, replying to a three paragraph message with one sentence..nice... unless he's JUST now getting the one I sent with all that TDS data like 4 days ago.
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  5. #45
    Av8tor1's Avatar
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    systematic approach chrono, by the numbers

    isolate the bladder tank (turn it's ball vavle off)

    first... what is the line pressure going to the inlet of the system with the system output at full flow (exactly where you see my gauge at in the pic)

    above 45?... then proceed, below 40 then we've got a problem with the supply pressure

    second.... with the system output at full flow what is the pressure at the membrane inlet

    less then 40 then see if you can close off the adjustable flow restrictor to get it to 40

    more then 40 then see if you can open the adjustable flow restrictor to lower it to 40 or set it at mid travel and record pressure

    third.... now measure brine rate

    brine rate 3:1 to 5:1?... if yes then proceed, if no then try to adjust flow restrictor to achieve something in that range and recheck pressure at membrane inlet... record the new pressure reading
    (open adjustable flow restrictor to increase the ratio, close it to lower the ratio)

    forth....measure tds at membrane inlet and outlet, record the numbers and caclulate rejection ratio



    and it will only trickle a little flow with the bladder isolated, thats why we need the bladder... to store up the flow so when we do need it, it will have a decent pressure and flow behind it

  6. #46
    ChronoKiento's Avatar
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    It looks like I've done something right.. the TDS is down to 12!

    I must've gotten the right brine ratio last night when I was messing with it. It's produced quite a lot of water in just one day too. I still ordered a better restrictor.. because really the one I have is not user friendly at all. I don't like dealing with the uncertainty of it. I just wanted a simple restrictor that means.. flush or restricted.. simple as that. I hope it gets here soon.
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  7. #47
    Admin- I'm growing CPs in the Desert of Tucson, Az. adnedarn's Avatar
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    What are you going to do with the adjustable one? I wouldn't mind checking it out....
    -Andrew
    Owner of TerraForums, FlyTrapShop.com, and cpforums.org.
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  8. #48
    ChronoKiento's Avatar
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    I'm going to burn it at the stake for giving me so much trouble.
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