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Thread: need help getting an RO unit

  1. #41
    Av8tor1's Avatar
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    from an old post of mine,

    Av





    I made this up for someone and thought it would be good to post, I know its kind of cheesey but oh well



    Cheers'
    Av

    Edit: adding additional comments as I think of them LOL

    * bladder tank must be isolated from system during brine ratio measurements
    * hydraulically operated automatic shut off valves will typically shut off the inlet to the membrane when the outlet pressure reaches 60% of inlet pressure
    * In a real world system getting 85% of rated flow is about the maximum attainable**
    * at 85% a 100gpd system should produce about 7.5oz/minute (bladder isolated)
    * In bladder tank systems, membrane efficiency drops proportionally as the bladder tank fills. This is due to backpressure on the membrane outlet.***

    ** inlet pressure, water temperature and TDS will have a major effect on membrane output
    (TFC membranes are usually rated at 77 degrees Fahrenheit @60psig and for every 1 degree drop, production drops 1.4% (57f water would reduce efficiency by 28%))

    *** This drop in efficiency can be prevented by the use of a permeate pump and 90% automatic shut off valve. The permeate pump isolates the membrane from this build up in back pressure. Since the pressure differential across the membrane now remains constant, membrane efficiency also remains constant resulting in greatly improved recovery rates. This isolation also allows us to replace the 60% ASO valve with a 90% ASO thereby utilizing more of the bladder capacity and increasing output pressure. These modifications will result in a 60-80% drop in water consumption and brine output. In addition, this drop in water consumption also results in a proportional increase in prefilter life. A nice, simple and fairly inexpensive mod for any system using a bladder accumulator tank.

    is all that clear as mud?

  2. #42
    --Freedom Czar-- Fryster's Avatar
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    Yes.

    Good answers Av. Thank you very much for taking time to answer my questions.

    The above graph works very well. In fact, it gives a whole new meaning to the term, "flow chart".........



    ***I hope PK is paying attention too.
    Only a moral and virtuous people are capable of freedom; the more corrupt and vicious a people becomes, the more it has need of masters. -- Benjamin Franklin

  3. #43

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    Oh I'm paying attention, just kind of lost lol.

    I'll probably buy the last link I posted w/ a permeate pump at some point. I think that should be sufficient for my needs.
    Z polski y dumny
    Prayer - how to do nothing and still think you're helping.
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  4. #44
    Av8tor1's Avatar
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    YW Fry... hope it helps

    PK, dont worry... when you own one and change filters a couple times it will all make sense.
    Trying to understand one by reading threads would be difficult at best.

    get the basic unit and get a decent one... and we'll go from there mate,

    main thing... have good water pressure, get a TDS meter and a cheap 0-100 psi pressure gauge

    then with minimal guidance you will be able to diagnose and deal with any problems you might encounter

    I promise
    Av

  5. #45
    Nepenthes's Avatar
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    I know where to get the TDS meter now... but where should I get a cheap pressure gauge as you described AV? Also, if you were the one buying a new RO system, which would you choose for about 200-250$? Under 200 isn't a problem either lol .
    - Daniel

  6. #46
    Av8tor1's Avatar
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    Daniel,

    If it was me, I would prob still follow the same route I did originally... I went with the aqua-safe maximus system from ebay, then I got the permeate pump and 90% ASO from ebay (fixyourwater I think)... once the original filters need replaced I use the 3 pack replacement kit that is locally available at Lowe's for hmmm 20 something dollars. They seem to be of very good quality.

    The flow restrrictor is not as user friendly (idiot proof) as their old models, basically it is adjustable now... just follow their directions or put it in half travel to begin with and Ill walk you through the adjustment process... it isnt hard and is a no brainer after the first time.

    The gauge... once your kit arrive, simply go to any hardware store, lowes or Home depot. Northern tool has them for about 5 dollars. I use the one from aqua-safe, but it is more expensive at around 25$ IIRC

    the aqua-safe system will run you about 140 to the door, the permeate pump and 90% ASO another 60 or so (guessing)

    most have been very happy with the aqua safe product by far but a few have struggled with the flow restrictor... read the directions and have your TDS meter and gauge on hand before you begin.

    Daniel, PK, Fry.... It has been several years since I purchased my stuff, ask around and make sure these are still good sources. A lot can change in 4 or 5 yrs... look at their feedback, do your homework.. Pleae use my recommendations as a starting point, not an end all k

    maybe start a "survey" LOL

    HTH's
    Av

    warning...there is currently one system on ebay which includes the permeate pump and shipping for 125... buyer beware, something sure dont smell right

  7. #47
    Cardiac Nurse JB_OrchidGuy's Avatar
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    Butch, My GF's house has a water softener. It is correct in thinking that if I connect a R/O unit to the softened water it would increase the life of all the filters whil giving me pure water as the membrains and other filters will remove the salt that originaly removed the minerals? I will definately be looking into getting a system when I move.

    Now here is a question. If your just filling holding tanks to use with a pump then do you need the bladder tank to give you pressurized R/O water? Or would you still get one of those to have on demand water if your drain your holding tanks?
    JB
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  8. #48
    --Freedom Czar-- Fryster's Avatar
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    Thanks again Av,

    Yeah, like PK, I'm searching online for an RO system and still learning about the technology and such.

    I hope to order one in the next six weeks or so.........
    Only a moral and virtuous people are capable of freedom; the more corrupt and vicious a people becomes, the more it has need of masters. -- Benjamin Franklin

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