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RO & NF Membranes Brackish, Seawater & Fouling-Resistant

Dow Filmtec, Hydranautics, Toray, LG Chem, CSM, and NanoH2O elements — sourced through Lenntech with full technical datasheets and verified specifications.

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Choose Your Membrane

Six global brands — each with verified specifications from Lenntech's official datasheets.

Dow Filmtec BW30-400 RO Membrane Element
DOW FILMTEC

BW30-400 Series

  • Active area: 400 ft² (37 m²)
  • Permeate flow: 10,500 gpd (40 m³/d)
  • Stabilized salt rejection: 99.5%
  • Membrane type: Polyamide Thin-Film Composite
  • Max operating pressure: 600 psi (41 bar)
  • Max temperature: 113°F (45°C)
View Dow Filmtec →
Hydranautics SWC5-LD Seawater RO Membrane
HYDRANAUTICS

SWC5-LD Seawater

  • Active area: 400 ft² (37.1 m²)
  • Permeate flow: 9,000 gpd (33.9 m³/d)
  • Average NaCl rejection: 99.8%
  • Minimum NaCl rejection: 99.7%
  • Max pressure: 1,200 psi (82.7 bar)
  • Membrane type: Low Fouling Thin Film Composite
View Hydranautics →
Toray TMG20-400 Brackish Water RO Membrane
TORAY

TMG20-400 Brackish Water

  • Active area: 400 ft² (37.1 m²)
  • Permeate flow: 10,200 gpd (38.4 m³/d)
  • Average NaCl rejection: 99.5%
  • Minimum NaCl rejection: 99.0%
  • Max pressure: 365 psi (25.2 bar)
  • Max temperature: 113°F (45°C)
View Toray →
LG Chem SW400R Seawater RO Membrane
LG CHEM

SW 400 R Seawater

  • Active area: 400 ft² (37 m²)
  • Permeate flow: 9,000 gpd (34.1 m³/d)
  • Stabilized salt rejection: 99.85%
  • Minimum salt rejection: 99.7%
  • Boron rejection: 93%
  • Feed spacer: 34 mil
View LG Chem →
CSM RE8040 Series RO Membrane
CSM / SAEHAN

RE8040 Series

  • Available models: RE8040-FD, -FE, -FE34, -FL, -FN
  • Element size: 8" spiral wound
  • Application: Brackish water, fouling resistant
  • Also available: 16" REI6040-BE element
  • Chlorine resistant: 4" and 8" options
  • Certification: NSF available on request
View CSM / Saehan →
NanoH2O QuantumFlux Qfx SW 400 R Seawater RO Element
NANOH2O

QuantumFlux Qfx SW 400 R

  • Membrane polymer: Thin-Film Nanocomposite (TFN)
  • Permeate flow: 34 m³/d (9,000 gpd)
  • Stabilized NaCl rejection: 99.85%
  • Minimum NaCl rejection: 99.75%
  • Active area: 37 m² (400 ft²)
  • Boron rejection: 93%
View NanoH2O →
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Compare All Membrane Series

All specifications below are taken directly from Lenntech's official datasheets.

Parameter Dow Filmtec BW30-400 Hydranautics SWC5-LD Toray TMG20-400 LG Chem SW 400 R CSM RE8040 Series NanoH2O Qfx SW 400 R
Application Brackish water Seawater Brackish water Seawater Brackish / fouling resistant Seawater
Active Area 400 ft² (37 m²) 400 ft² (37.1 m²) 400 ft² (37.1 m²) 400 ft² (37 m²) Varies by model 37 m² (400 ft²)
Permeate Flow 10,500 gpd (40 m³/d) 9,000 gpd (33.9 m³/d) 10,200 gpd (38.4 m³/d) 9,000 gpd (34.1 m³/d) Varies by model 9,000 gpd (34 m³/d)
Salt Rejection (Avg) 99.5% 99.8% 99.5% 99.85% Up to 99.5%+ 99.85%
Salt Rejection (Min) — 99.7% 99.0% 99.7% — 99.75%
Max Pressure 600 psi (41 bar) 1,200 psi (82.7 bar) 365 psi (25.2 bar) 1,200 psi (82.7 bar) Varies 1,200 psi (82.7 bar)
Membrane Type Polyamide TFC Low Fouling TFC Cross-linked Polyamide TFC TFC Thin-Film Nanocomposite (TFN)
Boron Rejection — — — 93% — 93%
Feed Spacer — 34 mil — 34 mil 28 / 34 mil 28 mil
Certification NSF / ANSI 61 — — — NSF available NSF Standard 61
Data source: All specifications are taken directly from Lenntech official datasheets (Dow Filmtec BW30-400, Hydranautics SWC5-LD, Toray TMG20-400, LG Chem SW 400 R, CSM/Saehan RE8040 Series, and NanoH2O Qfx SW 400 R). Performance data is given for information purposes only and is subject to modification depending on actual water quality. Contact TOP Technique for membrane selection assistance.
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How to Choose the Right Membrane

Three key factors determine the best membrane for your application.

💧

Feed Water Quality

Brackish water (<10,000 ppm TDS) calls for BW30-400, TMG20-400, or CSM RE8040. Seawater (35,000 ppm TDS) requires SWC5-LD, LG SW 400 R, or Qfx SW 400 R.

⚡

Energy Efficiency

Low-pressure membranes like Toray TMG20-400 operate at just 365 psi (25.2 bar) — ideal when reducing energy costs is a priority.

🛡️

Fouling Resistance

For challenging feed water, choose Hydranautics SWC5-LD (Low Fouling Technology), CSM RE8040-FD/FL, or LG SW 400 R with 34 mil spacer.

How RO Membranes Work Inside a Plant

Watch how reverse osmosis membranes separate salt from seawater at the molecular level. This 3D animation shows the spiral-wound element construction, feed spacer geometry, and permeate collection — the same membrane technology TOP Technique supplies every day.

Request Membrane Quote →
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Need Help Selecting the Right Membrane?

Send us your feed water analysis and operating conditions — our engineers will recommend the optimal membrane element and provide a full quotation.

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