AXEON XE1-4040 RO Membrane, 4" x 40"

Restore Full Rejection Rate to a Worn RO System

A reverse osmosis membrane's rejection rate drops gradually as it fouls with use, and by the time TDS in the permeate water is noticeably higher, the membrane has usually been past its effective service life for a while. The AXEON XE1-4040 is a fiberglass-wrapped, NSF-61 certified membrane element rated for 99.2% nominal rejection at a low 100 psi operating pressure, restoring the filtration performance a worn membrane has lost.

Sized to the standard 4" x 40" format, it drops into an AXEON N-Series system or any other RO setup built around a standard 4040 membrane housing (Part #211757).

Key Features & Benefits

• 99.2% nominal rejection rate — removes the large majority of dissolved solids from source water passing through the membrane.
• Runs at a low 100 psi — operates efficiently at lower operating pressure, which supports energy savings over higher-pressure membranes.
• Fiberglass-wrapped construction — adds structural durability to the membrane element for standard housing use.
• NSF-61 certified — certified to the NSF/ANSI 61 standard for materials in contact with drinking water.
• Standard 4" x 40" format — fits AXEON N-Series systems and other standard 4040-membrane RO housings.

Who Should Use This Membrane

Facilities running an AXEON N-Series system or any other RO setup built around a standard 4040 membrane housing, and noticing rejection rate or permeate TDS drifting from spec, are the fit for this replacement membrane.

About AXEON Water Technologies

AXEON Water Technologies is a Temecula, California-based water treatment manufacturer and WQA member that designs and assembles its own membrane, filtration, and RO system components domestically, including replacement elements like this XE1-4040.

Frequently Asked Questions

How do I know when to replace an RO membrane?

Watch for a drop in rejection rate or a rise in permeate TDS on your system's controller, since both are signs the membrane has fouled or reached the end of its effective service life. Replacing it before rejection drops significantly further protects downstream water quality.

When should I replace this membrane relative to the pre-filter?

Membranes generally last longer than pre-filters since the pre-filter is the first line of defense against incoming sediment, but both should be checked on a regular schedule. A membrane replacement is a bigger job than a filter cartridge swap, so plan it around a scheduled maintenance window rather than an emergency.

What does NSF-61 certification mean for this membrane?

NSF/ANSI 61 is a certification standard covering materials and products that come into contact with drinking water, verifying they don't introduce harmful contaminants into the water passing through them. It's a materials-safety standard, not a performance rating on its own.

Is this membrane compatible with systems other than AXEON's?

Yes, it's built to the standard 4" x 40" membrane format used across many RO systems, not just AXEON's own N-Series line, so it fits any standard 4040 membrane housing. Confirm your system's housing uses that same standard size before ordering.

What operating pressure does this membrane need?

It's rated to run at a low 100 psi, which supports energy savings compared to membranes that require higher operating pressure to hit the same rejection rate. Lower operating pressure also puts less ongoing strain on the system's booster pump.