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Thread: Cheapest alternative to distilled bottled water?

  1. #11
    Av8tor1's Avatar
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    I've never seen one with a 7:1 or 8:1 ratio,

    the last one I helped a friend set up (this summer) was under 150usd

    Edit: I should say I've never seen a properly designed system with an 7 or 8:1
    Last edited by Av8tor1; 09-25-2016 at 10:10 AM.

  2. #12
    Av8tor1's Avatar
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    caveat, that was a system with no bladder tank, nor ASO valve,

    For a good, supply on demand system with permeate pump and bladder tank I would recommend a 200-225usd budget

  3. #13
    Av8tor1's Avatar
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    Quote Originally Posted by nimbulan View Post
    The last time I looked at affordable RO units, the waste water ratio was more like 7:1 or 8:1. I believe the big commercial units can reach 1:1. How much do the 3:1 / 4:1 units cost?
    membrane manufacturers recommend a brine ratio of 4:1. The waste water is what is constantly flushes the surface of the membrane clean. This is why it can last years as opposed to months for the prefilters.

    Where you run into the excessive brine ratio is when people buy systems with bladder tanks but no permeate pump.
    As the bladder tanks fills the pressure differential across the membrane drops proportionally.
    With the decrease in pressure differential the efficiency of the membrane drops and the brine ratio rises.

    The permeate pump prevents this buy isolating the membrane from the pressure built up in the bladder tank.

    Systems that do not use the bladder tanks ( no on demand supply) do not have this problem as they are designed to fill a reservoir or aquarium.

  4. #14
    BigBella's Avatar
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    Quote Originally Posted by Av8tor1 View Post

    Where you run into the excessive brine ratio is when people buy systems with bladder tanks but no permeate pump.
    As the bladder tanks fills the pressure differential across the membrane drops proportionally.
    With the decrease in pressure differential the efficiency of the membrane drops and the brine ratio rises.
    Me brain huuuurts . . .

    Last edited by BigBella; 09-25-2016 at 11:46 AM.
    “Sì perché l'autorità dell'opinione di mille nelle scienze non val per una scintilla di ragione di un solo . . ."

    -- Galileo "Biff" Galilei

  5. #15
    Tropical Fish Enthusiast jimscott's Avatar
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    This is what I use: [IMG][/IMG]

    I get a gallon about every half hour. I'm happy with it. It screws onto the kitchen sink. My wife got it for me. I think it was ~$70.

  6. #16
    goldtrap2690's Avatar
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    I use the Zero water pitcher. It's awesome and mine came with a tds meter. It cost me around $32 for the pitcher with filter and I've had it for more than 2 months with the water still reading 0 ppm (I've had it read my tap water as well so I know it's still working) I can get about less than a gallon in less then half an hour and use it at least twice a day. I live in San Francisco so my water is pretty soft and safe for cps to begin with.

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