LG BW 4021 ES NanoH2O Brackish Water RO Membrane 4" x 21"
The LG-BW-4021-ES is an LG NanoH2O™ 4" × 21" spiral-wound brackish water reverse osmosis membrane element built on LG's patented Thin-Film Nanocomposite (TFN) chemistry. High flow at 150 psi — compact 4" × 21" energy-saving element.
permeate flow (3.8 m³/d)
stabilized salt rejection
active membrane area
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-ES 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).
