Reverse Osmosis Drinking Water

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Improve the tast of meals
Improve the Taste of Meals

Manual with Installaton Instructions (pdf)



Nimbus Sierra Drinking Water System
Nimbus Sierra Water System
Compact Design
Compact Design
Easy to Use
Easy to Use
Nimbus Sierra Drinking Water System

Your Family and Friends Deserve the Best Drinking Water  Possible

The Nimbus Sierra Drinking Water System
glass after glass...flavor that's as fresh as spring water.

Fresh, Clear Water for ALL Your Drinking and  Cooking needs
Have you heard? "To get the best flavor, start with the finest ingredients." Water is no exception. Coffee, tea, juice, soup, and most baking and cooking recipes call for water. Improve the taste and flavor of everything you prepare with a Nimbus Sierra system that removes nearly all the salts, sediments, and chlorine taste and odor common to tap water.

Clean, refreshing drinking waterYour Quality Drinking Water Solution
Today, there are a number of water quality improvement choices. Yet, not all of these options offer the assurance that harmful and bad tasting elements have been removed. It is the reverse osmosis process pioneered by Nimbus that does more than just filter your water, it actually rids your water of impurities.

Safe, Great-Tasting Water...Certified.

Since 1968, Nimbus has looked for better ways to serve the growing need for safe, clean, great tasting water. In fact, they introduced the world's first under-the-counter reverse osmosis (RO) drinking water system for home use.


  • High-Flow Production Design: Delivers an abundance of safe, great tasting water.
  • Great Tasting Water at Your Fingertips: The Nimbus Sierra System is the most compact, easy-to-service under-the-counter system available.
  • Integrated Design with Color-Coded Fittings: Allows for rapid service and ensures hygienic filter exchanges.
  • Slim, Compact Design: Saves valuable under the counter space.
  • Quality Components
  • Reliable Performance with Decades of Experience
  • Environmentally Friendly Design
  • Low Maintenance

    And Great Options Like ...

  • Designer Faucets
  • Water Quality Monitor
  • High Capacity Storage Tank
  • Auxillary Connection for Refrigerator, Ice Maker, etc.


  • Complete Sierra RO Systems
    NS-1N30-00 RO System - $358.00
    thin film membrane - (36 gpd)
    (System includes installation manual, faucet, tank assembly and feed/drain connection hardware.)
    Free Ground Shipping in Continental U.S.
    Sierra Replacement Membranes & Filters

    104207 Internet Special $107.00
    Membrane & Filters

    Includes the Sierra Prefilter (104381), the 36gpd Membrane (104583) and the Postfilter (104382). These cartridges are designed for all plastic frame Sierra systems and newer metal-frame Sierra systems (purchased in 2005 or after).
    Free Ground Shipping in Continental U.S.

    Sierra Replacement Membranes  
    104583 thin film membrane $72.00
    (36 gpd)

    (white color code) -
    Free Ground Shipping in Continental U.S.
    Sierra Replacement Filters  
    104381 Sediment/GAC prefilter $18.00
    (green color code; for well water or municipal water - removes sediment and chlorine)
    Free Ground Shipping in Continental U.S.
    104382 GAC postfilter $19.00
    (blue color code; for well water or municipal water)
    Free Ground Shipping in Continental U.S.
    Optional Designer Faucet  
    click here for faucet and replacement tanks page
    How Reverse Osmosis Works

    "R.O." is Reverse Osmosis. It may sound technical, but osmosis is a natural, organic phenomenon, a process that occurs in nature on a continuous basis. Vegetation, like trees, plants and flowers attain their nutrients by using osmosis to draw water from the soil.

    The Nimbus process of R.O. works like this:

    The pressure from a household tap forces water through a Nimbus semipermeable membrane. This membrane separates the everyday household water at the molecular level. The membrane acts like a filter to isolate the contaminants, reducing them so that the water becomes purer, Reverse Osmosis water, with substantially reduced dissolved solids and contaminants. This cleaner, purer, refined water is then stored in a holding tank, ready at your convenience.


    This system has been tested and Certified by NSF International against ANSI/NSF Standard 58.
    NSF is the nationally recognized agency for the certification of reverse osmosis systems. Products with the NSF mark are certified to pass a series of stringent tests. Look for the NSF mark. It is your assurance the system meets its claims.


    Copyright © 2001-2014 Gilbert's Water Systems