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  1. Thread: 400 gpm RO

    by carls47807
    Replies
    10
    Views
    2,535

    Parallel or series will give you the same flow...

    Parallel or series will give you the same flow rate (gallons per hour). Series will allow the batch to flow across all three membranes, which reduces fouling and helps keep the membranes flushed. ...
  2. You could also get a stainless filter housing...

    You could also get a stainless filter housing rated to 300psi and put it after the pressure pump. The prefilter itself should be fine as the pressure differential across the filter would be minimal...
  3. Replies
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    1,233

    Hey Gord, Which directions are you using for...

    Hey Gord,

    Which directions are you using for end of season storage?
  4. A lot of the small RO housings use a plastic...

    A lot of the small RO housings use a plastic insert to seal the center permeate tube. It's possible that it came out (and stuck to) the old membranes when you pulled them out. Look down the center...
  5. Replies
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    369

    The check valve with the pink ring around it is...

    The check valve with the pink ring around it is really only used for domestic water applications. When the RO is used to make water in a pressurized tank, it stops the tank from draining back...
  6. Replies
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    255

    You would only want one of those prefilter...

    You would only want one of those prefilter housings. Having two or even three is just another sediment/sugar trap that stores bacteria and wastes additional prefilters. Even large RO's only use one...
  7. Replies
    9
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    806

    I have never seen a 400gpd membrane housing with...

    I have never seen a 400gpd membrane housing with 1/2" npt threads. Is 1/2" the ruler measurement, or are they actual 1/2" npt threads? I would run all your hoses 3/8" od, and terminate to a 1/4"...
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    401

    Hey Fred sorry we didn't know that! I will...

    Hey Fred sorry we didn't know that! I will direct inquiries directly to you!
  9. I have thought about this, but theoretically...

    I have thought about this, but theoretically speaking you would only increase the change in pressure by a maximum of 14.7psi, and that is if you pull a perfect vacuum. It would be much easier and...
  10. Replies
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    2,461

    Your membranes should be fine. As long as they...

    Your membranes should be fine. As long as they didn't dry out and there isn't an awful odor, I would get them back in and do a permeate rinse. If you notice anything, run some ro soap or hydrogen...
  11. Replies
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    231

    What model pump are you using? As a general...

    What model pump are you using?

    As a general rule for these small systems, you don't want to run more than 4x more membrane capacity than the rating of your pump (a 200gpd pump should be able to...
  12. Thread: CDL Nano RO

    by carls47807
    Replies
    10
    Views
    1,224

    Although I am slightly biased. The RO Bucket...

    Although I am slightly biased.

    The RO Bucket can get to a higher sugar percentage overall because it runs at 150psi (vs. the nano running at a max of 70-100psi). As sugar concentration goes up,...
  13. Thread: CDL Nano RO

    by carls47807
    Replies
    10
    Views
    1,224

    The RO Buckets with 3 or more membranes can...

    The RO Buckets with 3 or more membranes can easily concentrate to 6% in a single pass by running the concentrate 35% and 65% permeate. Flow rates would be the same as the cdl nano when doing that...
  14. oh sorry, those are for the cap to housing. Is...

    oh sorry, those are for the cap to housing. Is your housing stainless or fiberglass (with the plastic insert for the stem).
  15. https://www.maxwaterflow.com/Max-Water-Commercial-...

    https://www.maxwaterflow.com/Max-Water-Commercial-Membrane-Housing-O-ring_p_2422.html
  16. Thread: RO membrane

    by carls47807
    Replies
    5
    Views
    659

    If the membrane dried out it can not be saved. ...

    If the membrane dried out it can not be saved. The TFC membranes have to stay moist (ideally saturated) after they are put into service.
  17. Replies
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    4,149

    Got it, usually the fittings with the pink ring...

    Got it, usually the fittings with the pink ring have a check valve (stainless plunger with a spring).

    You do not need the shut off valve directly after the pump. You only need to throttle the...
  18. Replies
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    4,149

    plumbing looks correct. You won't need a shut...

    plumbing looks correct. You won't need a shut off valve on the permeate line, run that open all the time. Also, you have check valve fittings on your permeate outlets. If you have regular ones it...
  19. Replies
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    4,149

    In any typical RO system, where the booster pump...

    In any typical RO system, where the booster pump is not the limiting factor, parallel would probably be the best (in no way am I saying your MIT guy is wrong!). You could maintain a low % recovery...
  20. Replies
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    4,149

    If you really want to try and push 10%, set your...

    If you really want to try and push 10%, set your pump head to get at least 150psi, and keep the sap as cold as possible. Osmotic pressure is temperature dependent (direct relationship), and you are...
  21. Replies
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    534

    shoot me an email sales@therobucket.com We...

    shoot me an email sales@therobucket.com

    We don't have them listed on the site, but I have a bunch of them. I'll send you the oring and housing specs.
  22. Replies
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    534

    I have them, how many do you need?

    I have them, how many do you need?
  23. Replies
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    2,021

    I would get the model number off the booster pump...

    I would get the model number off the booster pump and look into what it is made of (stainless, brass, maybe look at an internal parts diagram). A lot of those older car wash boosters have cast iron...
  24. It’s probably a 1/4” npt, which is...

    It’s probably a 1/4” npt, which is similar in size to a 3/8” fine thread bolt.


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  25. Replies
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    2,259

    If untreated water is an option, hands down it...

    If untreated water is an option, hands down it would be the better one.


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