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Thread: R/O

  1. #1

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    Hello Guys,
    I have always used rainwater for my CPs, but this is going to have to change. I am now using almost 5 gallons a day and I just don't have the time any more to fill up milk gallons. I have been thinking about getting a R/O filter, but I have a few questions.

    -Can R/O Filters be hooked up to a garden hose?
    -Can R/O Filters pump there own water out of a trash can or something?
    -What size R/O filter would I need to supply my needs of 3-5 gallons a day?

    Can any of you guys recommend some R/O Filters?

    Any help would be greatly appreciated!

    Mike
    Lover of Mexican Pinguicula

  2. #2
    Nepenthes Specialist nepenthes gracilis's Avatar
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    Hey boss,

    To answer your questions:

    1.) RO units can most certinaly be adapted to use with a garden hose.

    2.) They can pump water INTO a container, but you'd need another pump or something to transport it back out of the resevoir. Or have a pressurized tank which can be very expensive and uneeded for the most part.

    3.) I would say get a 25gpd membrane or so. If you use 3-5 gallons a day which is about as much as I use now, a 25 gallon per day (gpd) membrane will give you a constant supply of water.

    4.) A good place that was reccomended to me and I plan to order from them is: http://www.spectrapure.com/

  3. #3
    It's been one of dem days BigCarnivourKid's Avatar
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    Post

    Quote Originally Posted by [b
    Quote[/b] (Sarracenia0 @ Mar. 16 2004,17:40)]-Can R/O Filters pump there own water out of a trash can or something?
    RO filters use the pressure of the water to force the water molecules through the RO membrane. To work from a trash can or other reservoir, you would have to pump the water from the container to the RO filter or the container would have to be elevated above the RO filter enough to provide the needed operating pressure. Best bet is to hook the RO filter to the garden hose or better, hook it directly into the plumbing under the kitchen sink.

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    i plan on getting this one. what do you think?

    http://www.spectrapure.com/St_line_p1.htm
    Lover of Mexican Pinguicula

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    Nepenthes Specialist nepenthes gracilis's Avatar
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    Sounds good to me. Might want to make sure you monitor how much water you're using, the chlorine filter needs to be replaced every 1500 gallons, or to be on the safe side, just replace every 6 months.

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    I am also planning on getting an R/O filter but notice the water purity depends on the number of "filter stages" (2 thru 7) on the system.
    What is the minimum number of stages that will produce water clean enough for our CPs?

  7. #7
    Tony Paroubek's Avatar
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    I would suggest at least a 3 stage for water containing chlorines
    stage 1 sediment filter
    stage 2 carbon block
    stage3 ro membrane
    Cheaper units will combine stage 1 and 2 into a sediment/carbon filter but I would avoid them. The sediment filter is there to keep the carbon block from getting clogged. And a seperate carbon block will do a much better job of keeping Chlorines from the RO membrane.

    For water not containing chlorines (ie well water) you can get by with 2 stage
    stage 1 sediment
    stage 2 ro

    You will also want to look for a TFC membrane that has a rejection rate around 98% (any decent unit with a tfc membrane should be in this range). Don't go with a CTA membrane.

    I would also suggest getting a unit rated much larger than you currently need or will need in the near future. They only produce their rated output when water temperature is around 77 and pressure around 100psi.. conditions you will not likely get from hooking to municipal or well pump supply. So don't be surprised if you only produce half what the unit is capable of if your water is really cold or pressure low.
    Tony



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  8. #8

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    if you want to look at R/O units go to www.drsfostersmith.com and go to www.peteducation.com to find out more about R/O units.
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