US Water 300 GPD Premium Wall-Mount Light Commercial RO System with 20 Inch Pre-Filters

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We have replaced this product with a newer and better performing system.  See the new system here: Raptor System. Replacement filters for the discontinued system are listed to the right.

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US WATER 300 GPD Premium Low-Energy RO with Enhanced Chloramine Removal

If you are looking for a light commercial reverse osmosis system that can deliver up to 300 gallons per day with feed water of up to 1,500 TDS, then this is it! It is designed for overall high performance, high recovery rates, minimal energy consumption and offers great savings with low maintenance and operation costs. It also features a compact space saving design, excellent pre-filtration and quality components built in the U.S.A. This is a premium system at a very economical price, this is simply the best solution.

Additionally, this is designed to be a low energy system with AXEON Extra Low Energy Membranes which operate at 80 to 100 psi. This conserves energy and prolongs system life as most commercial RO systems operate at 200+ psi. It’s like running a car at 50 MPH verses 100 MPH! Our US Water RO systems operate at 100 psi and deliver the same amount of water our competitors do at 200 psi. Do you want to guess which system uses less energy? Which system do you think will last the longest - the one at 100 psi or 200+ psi? The choice is simple, the US Water 300 GPD Light Commercial Reverse Osmosis System will work better, last longer and cost less to operate.



  • Fully Equipped, Yet Economical
  • Corrosion Resistant Frame Will not Rust
  • Special Pre-Filters Remove Both Chlorine and Chloramine
  • Pressure Gauges for Monitoring Pump Pressure, Pre-filter Pressure and Permeate Pressure
  • Low Energy Membrane Conserves Energy by 20%
  • Low Energy Membrane Increases System Life
  • Built-in Dual TDS Meter Monitors Incoming and Product Water Quality
  • Lightweight Compact Space Saving Design
  • Pre-Plumbed, Wired & Assembled
  • Plug & Play
  • Components Easily Accessible for Service
  • CE Compliant
  • 2-Year Limited Warranty, if Purchased as a System
  • Made in the U.S.A.


  • White Powder Coated Aluminum Frame
  • 5 Micron Sediment Pre-filter Protects the System
  • 10 Micron Carbon Block Pre-filter Remove Chlorine
  • Catalytic Carbon Pre-Filter Removes Chlorine and Chloramine
  • High-Quality Pentek Filter Housings for Years of Longivity
  • AXEON® Fiberglass Membrane Housing
  • 0-300 psi Glycerin-Filled Pump Pressure Gauge
  • 0-100 psi Glycerin-Filled Pre-Filter Pressure Gauge
  • 0-100 psi Glycerine-Filled Permeate Pressure Gauge
  • John Guest® Push/Pull fittings with Locking Safety Clips
  • AXEON HF-5 Low-Energy Membranes
  • Built-In Dual TDS Meter
  • Aquatec® High Flow Booster Pump
  • Aquatec® Tank Pressure Switch
  • Aquatec® Feed Solenoid Valve
  • Aquatec® Auto Flush Timer Valve


Configuration Single Pass
Feed Water Source TDS < 1500
Standard Recovery Rate 50%
Rejection and Flow Rates
Nominal Salt Rejection % 98.5
Permeate Flow* gpm (lpm) 0.21 (0.79)
Concentrate Flow gpm (lpm) 0.21 (0.79)
Feed inch 3/8 Tube
Permeate inch 3/8 Tube
Concentrate inch 3/8 Tube
Membranes(s) Per Vessel 1
Membrane Quantity 1
Membrane Size 2521
Vessel Array 1
Vessel Quantity 1
Pump Type Aquatec 5800
Standard Voltage 110V 60Hz 1 PH
Voltage Amp Draw 1.0
Systems Dimensions ***
L x W x H inch (cm) 9 x 27 x 19 (22.9 x 68.6 x 48.3)
Weight lb. 53
Operating Limits
Maximum Feed Temperature °F (°C) 85 (29.00)
Minimum Feed Temperature °F (°C) 40 (4.44)
Maximum Ambient Temperature °F (°C) 120 (48.89)
Minimum Ambient Temperature °F (°C) 40 (4.44)
Maximum Feed Pressure psi 85
Minimum Feed Pressure psi 45
Maximum Operating Pressure psi 120
Maximum SDI Rating SDI < 3
Maximum Free Chlorine ppm 0
Maximum TDS ppm 1500
Maximum Hardness gpg 1
Maximum pH (Continuous) 11
Minimum pH (Continuous) 3
Maximum pH (Cleaning 30 min) 12
Minimum pH (Cleaning 30 min) 2
Maximum Turbidity NTU 1

*Product Flow rates are based on equipment test parameters.
**Call for other voltage options.
***Does not include operating space requirements.

Test Parameters: *550 TDS Filtered (5 Micron), De-Chlorinated, Municipal Feed Water, 100 psi (6.89 bar) Operating Pressure, 77 Degrees F (25 Degrees C), Recovery as stated, 7.0 pH. Data taken after 60 minutes of operation. Scale prevention measures must be taken to prolong membrane life.

Low temperatures and high feed water TDS levels will significantly affect system’s production capabilities. Performance projections should be run for individual applications which do not meet or exceed minimum and maximum operating limits.

Add an optional Structural ROMate Reverse Osmosis Tank

The ROMate Tank offers high-performance, high-value vessels for residential and light commercial reverse osmosis applications. ROMate tanks are specifically designed for reverse osmosis systems, these small vessels offer big advantages over competitive tanks via100% seamless,composite construction, and theability to discharge in any position.

Key Features

  • 100% seamless composite construction
  • Discharges in any position
  • Produced using NSF and/or FDA listed materials
  • Meets stringent US requirements for water components
  • Environmentally safe, 100% lead-free
  • Will not introduce chemicals or elements into water
  • Pre-installed inlet-outlet assembly: comes with system connections, saving time and money
  • Factory-backed 5-year warranty
  • Materials of construction
    • High density polyethylene inner liner
    • Fiberglass-wound and epoxy resin-sealed outer shell

additional information

Warranty1 Year Manufacturer's Warranty
RO Production0-.9 GPM
ManufacturerUS Water Systems
More Information