900 – 1800 GPD Commercial RO

The NRO 2540 Series is designed for Commercial or Light Industrial applications requiring flow rates of 900 – 1800 gallons per day (GPD). The NRO 2540 Series features the durability of a powder coated steel frame, stainless steel pressure vessels, liquid filled panel mounted pressure gauges, and a rotary vane pump with a mountain bracket system that is easily removed for maintenance by one person.


Features and Benefits


A carbon steel frame for strength and rigidity is powder coated for long life & durability.


2.5" diameter by 40" length stainless steel membrane housing, 300 psi.


PROCON Positive Displacement Rotary Vane Pump, known as a carbonator pump, is designed and built to meet your needs for flow rates ranging from 115 to 330 gallons per hour at up to 250 psi.


High rejection membranes designed to perform at a lower pressure than standard membranes, which result in energy savings. Additional element types & ratings available.

Key Features

  • High Flow 5 Micron Front Mounted Prefilter for Ease of Service
  • Pump Throttle Valve & Pipe Mounted Discharge Pressure Gauge for Multi-Stage Booster Pumps
  • Glycerin Filled Gauges for Accurate & Steady Pressure Readings
  • High Quality Stainless Steel Membrane Housings
  • Brass or Stainless Steel Inlet Shut Off Valve
  • Replaceable Quick Connect Fittings for Ease of Field Repairs
  • Replaceable Motor Mounting System - makes field repairs easy, bracket mounts to motor and slides over frame
  • Powder Coated Frame for Long Life &
  • Float Switch & Pretreatment Interlocks- Standard on all Systems
  • Panel Mounted Concentrate Pressure Gauge
  • Permeate and Concentrate Flow Meters
  • Integrated Recycle Valve
  • High Flow TFC Low Pressure Membranes - Additional Element Types and Ratings Available
  • Quick Connect Fittings on Gauges and Recycle Operation for Ease of Service 
  • Quick Connect Fittings on Rotary Vane Pumps
  • Extended Frame Legs with Plastic End Caps for Protection from Ground Contact and Ease of Movement
  • Carbon Steel Frame for Strength and Rigidity

Additional Resources



Repressurization packageRepressurization Systems - Pre-plumbed and ready to use when you receive them. These systems are custom-built to your specific application. Included in the plumbing package; 1" inlet threaded bulkhead fitting, float switch with 20ft cord, ½" overflow threaded bulkhead fitting w/plug, and 1" bulkhead fitting at the bottom of tank w/1" foot valve. All plumbing is pre-installed in your choice of storage tank size.

Bladder Tank Control - Used to charge a pressurized bladder tank instead of atmospheric storage. Used when smaller quantities of RO water are needed. Storage is restricted by pressure tank size. All controls and components are included to pressurize the bladder tank, including check valve and pressure switch.

Wall Mount Frame - Wall Mount Frame is easily mounted to walls when floor space is limited

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Permeate Flush - Uses the RO permeate water for flushing foulants from the system. Soaking the RO elements during standby with permeate can help dissolve scale and loosen precipitates, reducing the frequency of chemical cleaning.

Chip Control Box - The Chip Control Box is an economical option for a RO controller available for both eh SIMPLX and NRO - 440 systems up to 4 membranes. The smaller modular design allows for easier assembly, service, and flexibility with a clean and logical layout. It features 6 LED lights to indicate the system operation of the RO unit. The controller removes the need for a low-pressure switch to control the pump and a start delay to prevent system cycling. A switching power supply operates on 96-264VAC, automatically adjusting to the operating voltage. The voltage at the supply terminals is the voltage for the pump and valves.

Digital Display Electronic Control Box - The RO Control Box controls all the functions of the RO system. It also incorporates a TDS monitor as well as feed water temperature. It also controls the timing sequences of the solenoids and low-pressure switch, which are impossible to control mechanically. In addition, it gives a time delay for motor start and controls the float switches. It also controls higher functions such as the fast flush or permeate flush when ordered with the system. The Control Box has four different switchable programs installed. Custom controller programming is available to each customer’s preference and custom graphics.

Stainless Steel High-Pressure Centrifugal Pump - Stainless Steel High-Pressure Centrifugal Pump for Lasting Performance (1400 GPD only)

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Nelsen Commercial Reverse Osmosis System Specifications
  Model TypeFloor StandFloor Stand Wall MountWall Mount
  Model Number: NRO-F-12540S-700-1NRO-F-22540S-1400-1NRO-W-12540S-700-1NRO-W-22540S-1400-1
  Production GPD 90018009001800
  Membrane2-1/2" x 40" (1)2-1/2" x 40" (2)2-1/2" x 40" (1)2-1/2" x 40" (2)
  Permeate GPM**.62 GPM1.25 GPM.62 GPM1.25 GPM
  Feed GPM1.731.73
  % Recovery w/Recycle19-40%30-60%19-40%30-60%
  Pump.5 HP.75 HP.5 HP.75 HP
  FLA 60HZ 1Ø 110/2207.1/3.410/5.07.1/3.410/5.0
  Circuit Size20/10A20/10A20/10A20/10A
  Solenoid Voltage110v110v110v110v
  Permeate3/8" 3/8"3/8" 3/8"
  Shipping Dims (DxWxH)34"x25½"x58"34"x25½"x58"48"x40¾"x29¼"48"x40¾"x29¼"
  Weight - Pounds104 lbs.118 lbs.106 lbs.120 lbs.

* 110 Volt Not Available    ** Consult Factory    *** Minimum pressure of 35psi dynamic   **** The stated product performance is based on data taken after 30 minutes of operation at the following test conditions:  2,000 mg/L NaCl solution at 225 psig ( 1.5 MPa) applied pressure, 15% recovery, 77o F (25o C), pH 6.5–7.0