Hydranautics Membrane Elements


The world's leading high productivity, energy-saving polyamide membrane

Offers the same rejection characteristics as ESPA2 but with even higher flow rates

ESPA2 LD has minimized biofouling, minimized colloidal fouling and enhanced cleanability

Provides a new option for communities where boron levels are naturally high or for manufacturers challenged by boron contamination issues

Increased active surface area for higher flux and rejection, with the same superior boron rejection as the ESPAB

A New Generation of ESPA Performance
The growing family of ESPA (Energy-Saving Polyamide) RO membranes continue to meet the ever-increasing demands of the water treatment industry. Industrial users worldwide have made ESPA their first choice for high productivity and salt rejection.

There's an ESPA solution to satisfy even the most challenging water treatment needs with exceptional performance, productivity and savings.


The workhorse and industry standard, CPA2 delivers consistently high performance, day in and day out

The element with the best combination of productivity and salt rejection available

PA5-LD has minimized biofouling, minimized colloidal fouling and enhanced cleanability.

High Performance for the highest quality water.

When high performance counts, CPA membranes from Hydranautics set the standard for RO membrane elements.

CPA membranes provide the highest salt rejection rates available - every element on every order for every customer.


The highest boron rejection available

SWC4+ Max
Ten percent additional active surface area and exceptional boron rejection

SWC4+B Max
Ten percent additional active surface area and superior boron rejection

Lower fouling for maximum performance

SWC5 Max
Ten percent additional active surface area and flow and superior boron rejection.

The first choice in seawater desalination.

Hydranautics has over two decades of experience in desalination and over 1.7 million cubic meters (461 million gallons per day) of seawater treated by their SWC (seawater composite) membranes. SWC seawater desalination membranes are available in high productivity 8-inch and 4-inch elements, all offering the highest levels of salt rejection and a consistently pure end product. Membrane formulations are designed to accommodate varying levels of seawater salinities worldwide with reliable field-proven performance.


The Low Fouling Composite LFC3-LD (Low Differential pressure) reduces fouling in wastewater and in surface water with high fouling potential for reuse and reclaim applications.

True hydrophilic membrane chemistry.

Superior membrane technology is the key to Hydranautics' innovative LFC (Low Fouling Composite) membrane. LFC membranes offer breakthrough technology in the treatment of difficult feedwaters and municipal wastewater. Until now, these applications have required significant pretreatment prior to subjecting them to a composite polyamide membrane.

The LFC3-LD is designed with a thicker brine spacer lowering the Delta P meeting the increased demand for lower fouling membranes that require less frequent cleanings while maintaining a high permeate flow. The LFC3-LD provides 11,000 gallons per day (41.6 m3/d) of flow at 99.7% nominal salt rejection. This membrane is well suited for the treatment of difficult feed waters for numerous municipal and industrial applications, which up to now required significant feed water pretreatment upstream of any composite reverse osmosis membrane.

Product Brochures

Hydranautics - Membrane Elements


Pentair - XFlow Membrane Elements

pdf-iconPentair - XFlow Membrane Elements

Pressure Vessels

pdf-iconPressure Vessels



Highly Efficient Energy Recovery Devices

pdf-iconEnergy Recovery Desalination Products