Nimbus Sierra RO


  • Four-stage reverse osmosis drinking water system for fresh tasting, clear drinking water.
  • Great tasting drinking water for pennies per gallon.
  • Membrane options include 36 GPD, 50 GPD, 75 GPD.
  • Reverse osmosis membrane reduces total dissolved solids (TDS) by 96%.
  • Top quality coconut carbon post-filtration provides final  polishing for the freshest taste.
  • Easy to install with pre-connected, color coded tubing and hygienically sealed filter cartridges.
  • Easy to maintain. Replace the filter cartridges without tools.
  • Compact design saves under-the-counter space.
  • Manufactured in the USA.

Four Stages For Better Drinking Water

Stage 1 & 2:  A combination filter, with 20 micron mesh and granular activated carbon, remove dirt and rust while reducing chlorine and organic compounds.

Stage 3: The reverse osmosis membrane reduces dissolved salts, metals, microorganisms and other impurities.

Stage 4: A coconut-based granular activated carbon postfilter is the final step in giving you fresh tasting, clear water.



The Sierra 4-stage reverse osmosis systems delivers gallons of clean, clear drinking water. Choose from 36 GPD, 50 GPD, 75 GPD membrane options. The Sierra features hygienically sealed filter cartridges and color-coded fittings for easy installation and service.

NS-1N30 NS-1N50 NS-1N75
Stage 1 Prefilter 20 micron 20 micron 20 micron
Stage 2 Prefilter GAC GAC GAC
Stage 3 RO Membrane 36 GPD 50 GPD 75 GPD
Stage 4 Postfilter GAC GAC GAC
Demensions 14.5″H x 12″W x 4.75″D


Total Dissolved Solids (TDS) <2,000 mg/L (ppm)
Feed Temperature 40° F-100° F
Feed Pressure 40-80 psi
Turbidity <1 NTU
Silt Density Index <5
pH 4-8
Chlorine <1.0 mg/L (ppm)

Feed water must be potable. Must be free of potential membrane foulants such as Iron, Hydrogen Sulfide and Manganese.


When properly maintained, the Sierra system will provide you with years of trouble-free service. The cartridges in this system must be replaced on a regulas basis to maintain efficiency and to ensure high water quality. Test your water every 6 months using a Digital TDS meter. Consider membrane replacement when the TDS rejection falls below 85%.

NS-1N30 NS-1N50 NS-1N75
Prefilter 6-12 months 104381 104381 104381
RO Membrane 12 months 104583 104032 104878
Postfilter 6-12 months 104382 104382 104382
Chrome Faucet As needed 103242
Nickel Faucet 107197
2-Gallon Tank 104946
Digital TDS Meter 100877