The ForeverPure SWRO-HE-2000TPD-PX is a skid-mounted, single-train high-efficiency seawater reverse osmosis plant producing 530,000 GPD (2,000 m³/day, 23 L/sec) of potable-quality permeate from seawater of up to 40,000 ppm TDS. It is built around an isobaric pressure-exchanger energy recovery architecture: two ERI PX Q300 pressure exchangers with an ERI HPXP booster set, paired with a Danfoss APP 86 axial piston high-pressure pump under variable frequency drive control. The membrane array uses 144 LG NanoH2O SW 440 GR seawater elements in twenty-four 6-element pressure vessels.
Made in USA. Manufactured and fully wet-tested in Santa Clara, California. Qualifies for USMCA/NAFTA preferential treatment. Factory acceptance test with performance report prior to shipment; client witness welcome.
How the split-flow architecture works
Split-flow architecture. The pressure exchangers pressurise the concentrate-equivalent 60% of the feed using energy recovered from the brine, so the high-pressure pump is sized for only the remaining 40% — 250 HP instead of 500 HP.
Key components
Danfoss APP 86
1 × high-pressure pump- 367 GPM / 83.3 m³/h at up to 1,000 psi
- Duplex stainless steel; ceramic and hard-coated wear parts
- Water lubricated — no oil, no gearbox
- 250 HP (185 kW) TEFC, VFD rated
- Positive displacement — efficient across the full range
ERI PX Q300
2 × pressure exchanger- 550 GPM / 125 m³/h total — approx. 275 GPM per device
- Greater than 97% transfer efficiency
- One moving part — ceramic-on-ceramic rotor
- No scheduled overhaul, no lubrication, no oil
- Parallel arrangement permits service on one device
ERI HPXP booster set
1 × booster set- 550 GPM / 125 m³/h at approx. 50 psi differential
- Makes up PX outlet to membrane feed pressure
- Duplex / super duplex stainless steel wetted parts
- 30 HP TEFC, VFD rated
- VFD permits precise recovery rate control
LG NanoH2O SW 440 GR
144 × membrane element- Thin-film nanocomposite seawater elements
- 8" × 40", 440 ft² active area each
- 63,360 ft² total membrane area
- High flow and high rejection at reduced feed pressure
- Average flux approx. 8.4 GFD — conservative for element life
Danfoss APP 86 published flow and power curves.
Energy recovery flow balance
| Stream | Flow | Pressurised by |
|---|---|---|
| Permeate-equivalent feed | 367 GPM / 83.3 m³/h | Danfoss APP 86 (full pressure rise) |
| Concentrate-equivalent feed | 550 GPM / 125 m³/h | 2 × ERI PX Q300, plus HPXP booster for differential make-up |
| Total membrane feed | 920 GPM / 208 m³/h | — |
| High-pressure concentrate to PX | 550 GPM / 125 m³/h | Returned from the array at approx. 970 psi |
| Low-pressure concentrate to discharge | 550 GPM / 125 m³/h | Leaves the PX after energy transfer |
Technical specifications
| SWRO-HE-2000TPD-PX — design data | |
|---|---|
| Model | SWRO-HE-2000TPD-PX — skid-mounted, single train |
| Daily production rate | 530,000 GPD / 2,000 m³/day / 23 L/sec (367 GPM permeate) |
| Feed water | Seawater, less than 40,000 ppm TDS |
| Feed water temperature | 5 – 27 °C |
| Required feed water pressure | 70 psi at system inlet |
| Product water quality | Less than 400 ppm TDS |
| Recovery rate | 40% |
| Feed water rate | 920 GPM / 208 m³/h |
| Concentrate rate | 550 GPM / 125 m³/h |
| Max working pressure | 1,000 psi at 36,000 ppm |
| Membrane array | 144 elements in 24 × 6-element pressure vessels |
| Average permeate flux | Approx. 8.4 GFD |
| Energy consumption | Approx. 2.5–2.9 kWh/m³ at 25 °C feed, 35,000 ppm. Includes the RO system and standard feed pump; excludes the product water delivery pump. |
| High pressure pump | Danfoss APP 86 axial piston with integrated flushing valve, 250 HP TEFC, VFD |
| Energy recovery | 2 × ERI PX Q300 isobaric pressure exchangers + ERI HPXP booster set, 30 HP TEFC, VFD |
| Membranes | 144 × LG NanoH2O SW 440 GR, 8" × 40", 440 ft² each |
| Pressure vessels | 24 × 8-inch FRP, 6-element, 1,000 psi rated |
| Pre-filtration | Two-stage cartridge: 20-micron then 5-micron, FRP housings, 300 GPM rating, 6 units each |
| Multi-media filters | 48" D × 72" H, 6 units, automatic backwash |
| High pressure piping | Duplex stainless steel or 316L stainless steel |
| Low pressure piping | Schedule 80 PVC or reinforced high pressure PVC, 150 psi rating |
| Controls | PLC with HMI; start/stop, sequential and alarm control, coordinated VFD ramp |
| Power supply | 380V/50Hz or 460V/60Hz, 3 phase |
| Country of origin | Made in USA — Santa Clara, California. Qualifies for USMCA/NAFTA preferential treatment. |
| Lead time | 2-3 months for one unit after order confirmation and down payment |
Pre-treatment, post-treatment and auxiliary systems
| System | Description |
|---|---|
| Multi-media filtration | Depth filtration removes sand and sediment (turbidity) to approximately 20 microns using graded media. Automatically backwashes when clogged. Corrosion resistant composite and fiberglass tanks, 48" D × 72" H, 6 units. |
| Two-stage cartridge pre-filtration | Stage 1 — 20-micron sediment cartridge, protects the high-pressure pump, pressure exchangers and elements from suspended matter. Stage 2 — 5-micron cartridge polishing the feed ahead of the high-pressure section. 300 GPM rating, 6 housings each. |
| Antiscalant dosing | Metering injection system dosing antiscalant into the feed stream to prevent membrane scaling. Rate adjustable by stroke length and percentage. |
| Biocide dosing | Metering injection system controlling bio-fouling potential in the RO plant. |
| pH adjustment (post-treatment) | Metering injection into the product water stream, bringing product water pH to a neutral level of around 7. |
| Permeate water flush | Purges saltwater from the system before each shutdown and start-up, holding permeate in the vessels during shutdown. Also protects the pressure exchangers by displacing concentrate from the energy recovery loop. |
| Built-in membrane cleaning (CIP) | Includes a 316 SS high-flow pump. Cleans and sanitises the membrane system, initiated from the control panel. Recommended when differential pressure lead-to-tail exceeds 30 psi. |
| High product TDS diversion | If product TDS rises above a preset value the system alarms and diverts off-specification water to drain. |
Pre-filtration matters more on a pressure-exchanger plant. The PX rotor requires clean feed water to maintain its design clearances and service life, which is why the feed passes multi-media filtration and both cartridge stages before reaching the high-pressure section.
Instrumentation and controls
| Item | Detail |
|---|---|
| Water quality monitors | Digital panel mount feed water and product water TDS meters, giving real-time water quality data. |
| Flow meters | Panel mount feed water, product water and concentrate flow meters. |
| Pressure gauges | Liquid filled, 316 SS — feed water, working and concentrate pressure. |
| Pressure switches | Low feed pressure shut-off with indicator light; high pressure shut-off switch. |
| Level control | Product water and raw water tank level control. |
| Start permissive conditions | Power on; start button pushed; low pressure switch closed; permeate tank level below low level. |
| Automatic shutdown conditions | High working pressure; low inlet pressure below 20 psi; starter overload trip; product water storage tank level high; emergency shut-down button pushed. |
Warranty
| Component | Provider | Terms |
|---|---|---|
| RO system | ForeverPure | 12 months from commissioning or 18 months from shipment, whichever comes first |
| APP 86 high pressure pump | Danfoss | Manufacturer’s standard warranty (24 months from commissioning) |
| PX Q300 and HPXP booster set | Energy Recovery Inc. | Manufacturer’s standard warranty |
| RO membranes | LG NanoH2O | Manufacturer’s prorated warranty (3–5 years per manufacturer terms) |
| Pressure vessels | Manufacturer | Manufacturer’s standard warranty |
| VFD drives | Per brand (Schneider / ABB or equivalent) | Manufacturer’s standard warranty |
Availability: 2-3 months. Request a tailored design and quotation for your site.
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Frequently asked questions
What does a 530,000 GPD / 2,000 m³/day plant serve?
At 530,000 GPD (2,000 m³/day, 23 L/sec) this plant supports municipal-scale supply and large industrial demand — on the order of 15,000–25,000 people’s potable water.
What is the benefit of ERI PX Q300 isobaric energy recovery?
The PX transfers pressure from the concentrate stream directly to the feed stream at greater than 97% transfer efficiency — the highest of any commercially available energy recovery technology. It has one moving part, a ceramic rotor running on ceramic wear surfaces, and needs no scheduled overhaul, no lubrication and no oil changes.
Why does a plant this size need only a 250 HP high-pressure pump?
Because the two pressure exchangers pressurise 60% of the feed using energy recovered from the brine, the Danfoss APP 86 handles only the permeate-equivalent 367 GPM rather than the full 920 GPM. That halves installed high-pressure motor power from 500 HP to 250 HP, and is the main reason specific energy lands at approximately 2.5–2.9 kWh/m³.
Can the plant keep running while a pressure exchanger is serviced?
Yes, at reduced capacity. The two PX Q300 devices share the concentrate flow in parallel, so the system can be operated on a single device while the other is taken out for service.
Is the plant custom-engineered?
Yes. Plants at this scale are engineered to your feed-water chemistry, recovery target and site conditions. Contact our engineers for a tailored design and quotation.
Source: ForeverPure techno-commercial proposal “SWRO-HE-2000TPD-PX — 530,000 GPD / 2,000 m³/day High Efficiency Seawater Reverse Osmosis Desalination System” (2026) and the matching recommended spare parts schedule (2026). Component data per Danfoss, Energy Recovery Inc. and LG NanoH2O published specifications. Specifications are subject to change and to confirmation against your feed-water analysis at the time of order — please confirm all critical figures with ForeverPure engineering before purchase. Danfoss and APP are trademarks of Danfoss A/S; PX, PX Q300 and HPXP are trademarks of Energy Recovery, Inc.; NanoH2O is a trademark of LG Chem. Used here to identify the components supplied.
