Skip to product information
WS-4M Commercial Reverse Osmosis System – 7,000 GPD, Four-Membrane Skid
Request a quote
Reliable shipping
Flexible returns
The WS-4M-AF/EC-RC is a four-membrane, 7,000 gallon-per-day reverse osmosis skid: pre-plumbed, pre-wired and factory-assembled for commercial duty. Restaurants, ice and beverage, car wash and spot-free rinse, laboratory feed, boiler and cooling-tower make-up, and light industrial process water. Each unit is configured to your feed water and installation, so you pay for the capacity you need and not for a one-size-fits-all package.
Pricing: every system is quoted to your water and your site. Use the Request a quote button or call 844-928-3710 and tell us your expected daily usage and, if you have it, a recent water test or your city's water report. Freight: quoted with your order. Local delivery and installation are available in the Phoenix area.
Download the WS-M Series brochure (PDF) — all three models on one sheet.
Why this system
- Real controller, real numbers. The electronic controller continuously monitors permeate TDS so you can see membrane performance at a glance instead of guessing.
- Protects itself. Pretreatment lockout, low-pressure and storage-tank inputs stop the pump before damage happens. The pump will never run dry.
- Built to last. Powder-coated aluminum frame, multi-stage stainless pump, stainless membrane housings, stainless feed valve, and pump-pressure gauges you can actually read.
- Serviceable. Open frame layout, standard 20" big-blue pre-filter, standard 4" × 40" TFC membranes. No proprietary consumables.
- Low cost to run. Low-energy membranes and a concentrate recycle line bring recovery up to 60–75%, so less water goes to drain.
- Upgradeable. Heavy-duty vertical multi-stage pump packages and a three-phase control module with motor-matched overcurrent protection are available for demanding sites.
Specifications — WS-4M
| Rated production | 7,000 GPD (18.2 LPM) |
|---|---|
| Membranes | (4) 4" × 40" TFC |
| Recovery rate | Up to 60% |
| Pump motor | 2 HP |
| Voltage / frequency | 230 V · 60 Hz |
| Full-load amps | 13 A |
| Feed water connection | 1" FIP |
| Permeate outlet | ½" compression |
| Pre-filter cartridge | 20" × 4.5" BB · 5 / 50 µm |
| Flow meters | Permeate and concentrate standard; recycle flow meter optional |
| Concentrate recycle line | Standard |
| Low-pressure switch | Standard |
| Frame | Powder-coated aluminum, black or white |
| Dimensions (H × L × W) | 59" × 26" × 18" |
Feed water and operating limits
| Feed water temperature | 40–85 °F (4–29 °C) |
|---|---|
| Ambient temperature | 40–120 °F (4–49 °C) |
| Feed water pressure | 45–85 psi (3.1–5.9 bar) |
| Max. operating pressure | 150 psi (10.3 bar) |
| Maximum SDI | < 3 |
| Maximum turbidity | 1 NTU |
| Maximum free chlorine | 0 ppm |
| Maximum feed TDS | 2,000 ppm |
| Maximum hardness | 0 gpg (measured at the RO inlet, after pretreatment) |
| pH, continuous operation | 5–11 |
| pH, cleaning (30 min max.) | 2–12 |
Pretreatment is part of the package. Hardness and chlorine are the two things that shorten membrane life, so every system we install goes in with a softener and carbon filtration sized to the local water.
Standard features
- Electronic controller with permeate TDS monitoring
- Powder-coated aluminum frame, black or white
- 20" big-blue 5-micron sediment pre-filter
- Stainless steel multi-stage pump
- Low-energy TFC membranes in stainless steel housings
- Stainless steel feed valve and pump-pressure gauges
- Permeate and concentrate flow meters, recycle line, low-pressure switch
Controller
- 4-line LCD with plain-language status readout
- Inputs for pretreatment lockout, low feed pressure, and storage-tank level
- Pump-delay start; the pump will never run dry
- 4 adjustable program cycles, USB configurable
Options
- Fiberglass membrane housings
- Concentrate recycle valve and recycle flow meter
- Feed water TDS conductivity probe
- Feed water flush valve
- Stainless steel pump upgrade or heavy-duty vertical multi-stage pump
- High-pressure tank switch
- Permeate sample port
- TDS blending valve
- Alternate voltage motors
- Three-phase control module with pump overcurrent protection set to the actual motor amp draw
Rating conditions: 550 ppm TDS municipal feed water, 5-micron filtered and de-chlorinated, 65 psi (4.5 bar) feed, 100 psi (6.9 bar) operating pressure, 77 °F (25 °C), 7.0 pH, recovery as stated, after 60 minutes of operation. Colder feed water and higher TDS reduce production; we run a projection for your actual water before quoting. Scale prevention (softening or antiscalant) is required to protect membrane life.
Model code key — WS-#M-AF/EC-RC: #M = number of 4" × 40" TFC membranes · AF = powder-coated aluminum frame · EC = electronic controller with TDS monitor · RC = concentrate recycle line.