LG BW 4021 UES NanoH2O Brackish Water RO Membrane 4" x 21"
The LG-BW-4021-UES is an LG NanoH2O™ 4" × 21" spiral-wound brackish water reverse osmosis membrane element built on LG's patented Thin-Film Nanocomposite (TFN) chemistry. Ultra low 100 psi operating pressure — lowest energy consumption in class.
permeate flow (3.8 m³/d)
stabilized salt rejection
active membrane area
📄 Download the LG Water Solutions Datasheet (PDF)
Technical Specifications
Why LG NanoH2O TFN Membranes
- Thin-Film Nanocomposite (TFN) technology — proprietary nano-particles embedded in the polyamide active layer deliver higher flux and improved salt rejection vs conventional TFC membranes.
- Lower energy consumption — higher permeate flow at the same feed pressure means fewer elements and reduced CapEx/OpEx for the same plant output.
- Improved fouling resistance — smoother, more hydrophilic surface chemistry reduces biofouling and scaling, extending cleaning intervals.
- Proven at scale — installed in municipal and industrial plants worldwide, from small commercial systems to >500,000 m³/d desalination plants.
Compatibility & Replacement
LG-BW-4021-UES is a standard 4" × 21" spiral-wound RO element and fits all industry-standard 4×21 pressure vessels (Codeline, Bekaert, Protec, ROPV, etc.). It is a like-for-like swap for Filmtec/DuPont, Hydranautics/Nitto, and Toray 4" × 21" brackish water elements of comparable flow and rejection class.
B2B / OEM pricing available — volume discounts on full pressure vessel sets and container loads.
Specifications sourced from LG Water Solutions official product documentation. Permeate flow rates for individual elements may vary per manufacturer tolerance. Specifications subject to change; contact ForeverPure Place or LG Water Solutions for current datasheet. LG NanoH2O™ is a trademark of NanoH2O Co., Ltd. (formerly LG Chem Water Solutions).
Frequently Asked Questions
What is the LG-BW-4021-UES?
It is a 4" x 21" brackish water reverse osmosis membrane element from LG Water Solutions (NanoH2O), built on LG's patented Thin-Film Nanocomposite (TFN) chemistry. It produces up to 1,000 GPD.
What is Thin-Film Nanocomposite (TFN) membrane?
TFN is LG NanoH2O's patented membrane technology that embeds engineered nanoparticles in the polyamide layer, delivering higher permeate flow and salt rejection at lower energy than conventional thin-film composite (TFC) membranes.
What is the rated flow and rejection?
Up to 1,000 GPD, at standard test conditions (see the datasheet).
What pressure vessel does it fit?
A nominal 4-inch I.D. RO pressure vessel.
What is the price of the LG-BW-4021-UES?
Contact ForeverPure at 408-969-2688 or sales@foreverpureplace.com for current pricing and availability.
