The DEFENDER Commercial Brackish Water RO System by US Water Systems Inc (4,000–8,000 GPD) features gauges, flow meters, and a control panel on the front; made in the USA and built for heavy-duty commercial use.
The DEFENDER Commercial Brackish Water RO System by US Water Systems Inc features four vertical white filters on a black metal frame, delivers 4,000-8,000 GPD, and is made in the USA.
Front view of the DEFENDER Commercial Brackish Water RO System by US Water Systems Inc (4,000-8,000 GPD), made in the USA with labeled control panel, fiberglass membrane housing, pressure gauges, adjustment valves, and flow meters.
Two DEFENDER Commercial Brackish Water RO Systems by US Water Systems Inc (4,000–8,000 GPD) with pipes, tanks, and control panels are positioned side by side on metal frames against a white background.
The DEFENDER Commercial Brackish Water RO System by US Water Systems Inc (4,000–8,000 GPD) features gauges, flow meters, and a control panel on the front; made in the USA and built for heavy-duty commercial use.
The DEFENDER Commercial Brackish Water RO System by US Water Systems Inc features four vertical white filters on a black metal frame, delivers 4,000-8,000 GPD, and is made in the USA.
Front view of the DEFENDER Commercial Brackish Water RO System by US Water Systems Inc (4,000-8,000 GPD), made in the USA with labeled control panel, fiberglass membrane housing, pressure gauges, adjustment valves, and flow meters.
Two DEFENDER Commercial Brackish Water RO Systems by US Water Systems Inc (4,000–8,000 GPD) with pipes, tanks, and control panels are positioned side by side on metal frames against a white background.

DEFENDER COMMERCIAL BRACKISH WATER RO SYSTEM BY US WATER SYSTEMS | 4,000 TO 8,000 GPD

List Price: Factory Direct Price: SALE PRICE:
$13325.0 $8883.34
$8,595.00
$8,595.00
35% OFF FACTORY DIRECT SAVINGS
SKU: 223-DFBROM : 223-DFBROM-4000
The DEFENDER HD is a customizable commercial-grade RO system. It was designed to be durable, sustainable, economical, and eco-friendly. Built in the USA specifically with commercial and industrial applications in mind this system is made for “brackish water.” Brackish water occurs in a natural environment and has more saltwater than freshwater, yet not as much as seawater. It can result from mixing seawater and freshwater in areas where rivers meet the sea. It can also occur in untapped underground water systems. A standard Reverse Osmosis System with Standard “freshwater” membranes won’t treat brackish water. You will need a Defender HD system to effectively lower the salt level in your water.
Subtotal: $8,595.00

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The DEFENDER Commercial Brackish Water RO System by US Water Systems Inc (4,000–8,000 GPD) features gauges, flow meters, and a control panel on the front; made in the USA and built for heavy-duty commercial use.

DEFENDER COMMERCIAL BRACKISH WATER RO SYSTEM BY US WATER SYSTEMS | 4,000 TO 8,000 GPD

$14,325.00 $8,595.00
The DEFENDER Commercial Brackish Water RO System by US Water Systems Inc (4,000–8,000 GPD) features gauges, flow meters, and a control panel on the front; made in the USA and built for heavy-duty commercial use.
The DEFENDER Commercial Brackish Water RO System by US Water Systems Inc features four vertical white filters on a black metal frame, delivers 4,000-8,000 GPD, and is made in the USA.
Front view of the DEFENDER Commercial Brackish Water RO System by US Water Systems Inc (4,000-8,000 GPD), made in the USA with labeled control panel, fiberglass membrane housing, pressure gauges, adjustment valves, and flow meters.
Two DEFENDER Commercial Brackish Water RO Systems by US Water Systems Inc (4,000–8,000 GPD) with pipes, tanks, and control panels are positioned side by side on metal frames against a white background.

DEFENDER COMMERCIAL BRACKISH WATER RO SYSTEM BY US WATER SYSTEMS | 4,000 TO 8,000 GPD

$14,325.00 $8,595.00
Production Rate: 4,000 GPD
Select Pre-Treatment: None
Product Overview
Defender HD Logo

COMMERCIAL BRACKISH WATER RO SYSTEM

Designed to be sustainable and economical, the DEFENDER HD is a commercial grade RO system that is built to last! It comes standard with a two-year warranty* because we believe in the high-grade heavy duty commercial parts we put into it. You will quickly see that this RO system beats the competition hands down. Plus, it is made in the USA.

DEFENDER HD is for applications where the TDS is too high for a regular tap water reverse osmosis membrane typically over 2,000 TDS, and it's designed to handle water with high sodium, chloride, and sulfates.

Brackish water refers to a water source that has more salt than freshwater but not as much as seawater. The level of salt will vary depending on environmental factors and cannot be precisely defined. If you are not sure whether you need a DEFENDER HD system, contact one of our Water Specialists at 800-608-8792.

Woman Drinking Freshly Purified Softened Water
The DEFENDER by US Water Systems is a commercial brackish water RO system, featuring high-grade parts such as a control panel, fiberglass membrane housing, pressure gauges, adjustment valves, and flow meters. It measures 25 wide and 34 tall and offers capacities between 2,000 to 8,000 GPD.
The DEFENDER HD fiberglass membrane housing by US Water Systems Inc, featuring a robust design and dimensions of 25x60x25/34, is vital for the DEFENDER COMMERCIAL BRACKISH WATER RO SYSTEM BY US WATER SYSTEMS, ensuring compatibility with high-grade commercial parts.
Diagram of the DEFENDER Commercial Brackish Water RO System by US Water Systems Inc, showcasing water flow and membrane structure, along with contaminant separation. Includes comparisons of bacterial and pore sizes, featuring high-grade commercial parts for 2,000 to 8,000 GPD systems.

Permeate Flush

Permeate Flush is standard for our RO systems that can provide a membrane flush directly after shutdown. Permeate means “Product Water”, therefore we call this system Permeate Flush since it is using the product water to flush the membranes after shutdown. This is extremely effective when taking membrane life into consideration. If dissolved solids from the feed water are elevated this critically impacts the membrane’s life. This may not always be from the total dissolved solids (TDS).

Other cases have a particular element such as silica. When this is elevated our permeate flush is used to release it from the membrane after shutdown. If concentrated solids are left in the membrane housing after shutdown they can fall out of solution. When this happens, the solids remain in the membrane housing until the RO system starts up again. This then causes them to be pushed into the membrane instead of being flushed out as they would be during normal operation. These solids then build up inside the membrane reducing the lifespan and possibly causing damage.

KEY FEATURES AND BENEFITS

A Green Solution

Our Defender RO is up to 65% efficient

Commercial Pump and Motor

At the heart of the DEFENDER HD is a true commercial centrifugal pump. Compared to rotary vane and diaphragm pumps which offer no longevity. In fact, they frequently must be replaced every six months or so, and our centrifugal pump does not.

Panel-Mount

Flow Meters and pressure gauges with 316 stainless steel needle valves for precise control of production and wastewater

5-Micron Magna Pre-Filter

With 36 square feet of media for long life

Fiberglass Membrane Housing

These housings provide the best longevity with ease of replacement

Highest Rejection Rates

Up to 99% rejection

Defender Controller with TDS Meter

Enables you to continuously monitor water quality

Best Warranty in the Business

Two years on the system (does not include consumables such as membranes and filters)

 

A red circle with a diagonal line over the Defender Commercial RO System By US Water Systems | 2000 - 16000 GPD from US Water Systems Inc, emphasizing the prohibition of non-sustainable practices.

Diaphragm Pump

Very light duty pump for intermittent applications. Maybe something you would apply to an under-sink RO

A red prohibition symbol over a pump highlights sustainability, echoing the eco-friendly ethos of the Defender Commercial RO System by US Water Systems Inc (2000 - 16000 GPD).

Rotary Vane Pump

Light duty pump for small RO systems where continual operation is not critical, not for heavy duty operations

A blue and metallic, eco-friendly cylindrical water pump with visible labels and connectors, part of the Defender Commercial RO System by US Water Systems Inc, offering 2000 - 16000 GPD.

Multistage Centrifugal Pump

Engineered to operate continuously for long periods of time. A True Commercial Pump that you can count on

RO Specifications

Design 4,000 GPD 6,000 GPD 8,000 GPD
Configuration Single Pass
Feed Water Source City or Well Water
Recovery Rate 48% 58% 65%
Rejection and Flow Rates
Nominal Salt Rejection % 99.5
Permeate Flow* gpm (lpm) 2.78 (10.52) 4.16 (15.80) 5.56 (21.13)
Minimum Feed Flow gpm (lpm) 5.78 (21.88) 7.16 (27.20) 8.56 (32.53)
Maximum Feed Flow gpm (lpm) 9.00 (34.07) 14.00 (53.00) 14.00 (53.00)
Minimum Concentrate Flow gpm (lpm) 3.00 (11.36)
Connections
Feed inch 1" FNPT
Permeate inch 1/2" Tubing
Concentrate inch 1/2" Tubing
Membranes
Membrane(s) Per Vessel 1
Membrane Quantity 2 3 4
Membrane Size 4" x 40" (4040)
Vessels
Vessel Array 1:1 1:1:1 1:1:1:1
Vessel Quantity 2 3 4
Pumps
Pump Type Multi-Stage
Motor HP 1.5
RPM @ 60 3450
Electrical
Standard Voltage 220V 50Hz 1PH
Voltage Amp Draw 8.3    
System Dimensions**
L xW x H inch (cm) 25 x 25 x 65 (63.5  x 63.5 x 165.1)
Weight lb. (kg) 340 (154.2) 370 (167.83) 400 (181.44)
RO Operating Limits
Maximum Feed Temperature °F (°C) 105 (40.96)
Minimum Feed Temperature °F (°C) 40 (4.44)
Maximum Ambient Temperature °F (°C) 120 (48.89)
Minimum Ambient Temperature °F (°C) 35 (1.66)
Maximum Feed Pressure psi (bar) 85 (5.86)
Minimum Feed Pressre psi (bar) 35 (2.41)
Maximum Operating Pressure psi (bar) 200 (13.79)
Maximum SDI Rating < 3
Maximum Free Chlorine ppm 0
Maximum TDS ppm 6000
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
Literature | Manual Product Overview
Defender Brackish RO Manual
Defender Brackish RO Manual
Videos Literature | Manual

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