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Thread: RO Units: Parts and Their Functions

  1. #16
    Registered Member RandalB's Avatar
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    Default Re:RO Units: Parts and Their Functions

    This is a close up of the membrane housing cap. It only has one connector on it, this is the feed water inlet. Notice the 180 degree rotatable John Guest fitting, this is provided for ease of removal and installation of the cap. Many manufacturers will use cheap compression fittings on the membrane housing, even though it needs to be removed for servicing periodically

  2. #17
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    Default Re:RO Units: Parts and Their Functions

    Here is a closeup of the product end of the housing. Note the outlets for Product and Reject water. This particular housing is fitted with John Guest ports. This adds to total unit cost, but is worth it when it comes time to maintain the unit or replace the membrane

  3. #18
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    Default Re:RO Units: Parts and Their Functions

    Here, the Membrane housing is attached to the filter bracket with the membrane clips.

  4. #19
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    Default Re:RO Units: Parts and Their Functions

    This is a filter clip.

    It is used for attaching a final stage or "Polishing" filter to the membrane housing. 2 of them are used.

  5. #20
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    Default Re:RO Units: Parts and Their Functions

    Here, the filter clips are attached to the membrane housing

  6. #21
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    Default Re:RO Units: Parts and Their Functions

    This is an inline "Polishing" filter (Omnipure (tm) brand). It traps organic chemicals that make it through the membrane. It is fitted with John Guest fittings for ease of removal and replacement and the filter media is Granulated Activated Carbon. The flow direction is on the label.

  7. #22
    Registered Member RandalB's Avatar
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    Default Re:RO Units: Parts and Their Functions

    Here, the polishing filter is attached to the membrane housing with the filter clips

  8. #23
    Registered Member RandalB's Avatar
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    Default Re:RO Units: Parts and Their Functions

    High quality Polyethylene tubing is essential to the operation of the unit. This tubing is 1/4" Outside Diameter and .170" Inside diameter and has a working pressure of 230 PSI.

  9. #24
    Registered Member RandalB's Avatar
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    Default Re:RO Units: Parts and Their Functions

    The hose connects all the components of the RO unit via High Quality John Guest fittings. These fittings use a push in connection and are very simple to use and virtually leak free unlike the compression fittings that are commonly used in commercially produced RO units. John Guest fittings cost a little more but are worth it for their ease of use and reliability.

    Here's a link to more information about John Guest fittings:

    http://www.johnguest.com/makeconnect.asp

  10. #25
    Registered Member RandalB's Avatar
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    Default Re:RO Units: Parts and Their Functions

    Here's the connection between the final prefilter and the Mebrane housing. Note the use of 180 Degree rotatable fittings. This keeps the hose from crimping and stopping the waterflow.

  11. #26
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    Default Re:RO Units: Parts and Their Functions

    Here are the first two stages of the unit. They are spun polypropylene sediment filters. The one on the left is a 25 micron and the other is a 5 micron. They are designed to catch solid debris before it can foul the membrane.


  12. #27
    Registered Member RandalB's Avatar
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    Default Re:RO Units: Parts and Their Functions

    Here is the third stage prefilter. It is a solid Carbon block with 1 micron filtration. The purpose of this stage is dechlorination, microbal filtration and trapping of volitile organic chemicals in the feed water.

    Some makers will add a second carbon block in an effort to make their units appear better. The second is not needed in most municipal chlorinated water supplies and not at all in well applications where the water is not chlorinated. A second block can be used to help break the chlorine/ammonia bond in chloramine treated systems, allowing the membrane to reject most of the remaining ammonia.

    Granulated Activated Carbon should NOT be used prior to the membrane (As a prefilter) as the carbon dust remaining from manufacture may damage the membrane when the unit is first started

  13. #28
    Registered Member RandalB's Avatar
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    Default Re:RO Units: Parts and Their Functions

    Here is one of two types of Feed water connectors I provide with my RO units, a faucet connector.

    This particular one is made of brass for durabliltity and uses a John Guest connector for the feed hose.

    For the reef aquarists who are concerned with copper leaching from the brass, the amount is so miniscule that even if the membrane was not being used, there would be no danger to delicate invertibrates.

    The connector is 3/4" Garden hose thread (commonly used in utility sinks) and may require an adapter for kitchen or bathroom faucets

  14. #29
    Registered Member RandalB's Avatar
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    Default Re:RO Units: Parts and Their Functions

    Here it is again, attached to the inlet hose and port of the 1st stage prefilter. A short hose is used for the photo. On the real unit it would be much longer

  15. #30
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    Default Re:RO Units: Parts and Their Functions

    Here is the other type I provide, A self piercing valve. It has the only non push in fitting on the unit. This feed valve is only used on copper or steel pipe (steel pipe requires drilling) where there is no faucet or one is not convienient, such as an under counter installation.

    Notice the sharp needlelike projection under the valve body. This is what pierces the pipe.

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