GrowoniX GXM-600 600 GPD Replacement Membrane for GX600

The High Flow (HF) version is optimized for maximum water production at 600 GPD and is the most popular choice for most grow operations. The High Rejection (HR) version delivers a lower output TDS at a slightly reduced flow rate — the right choice when source water quality is poor or when your application demands the cleanest possible permeate.

The GXM-600 is a direct drop-in replacement for the EX600, EX600-T, and GX600 reverse osmosis systems. It sits in the GrowoniX lineup between the GX400 and the high-output GrowoniX GX1000 1000 GPD Reverse Osmosis System. It is not interchangeable with other GX Series membrane housings — confirm your model against the compatibility list before ordering.

RO membrane performance typically drops as water temperature decreases — most conventional membranes struggle to maintain rated flow and rejection in cold water conditions. The GXM-600's ultra-low energy design is specifically engineered to sustain high flow and high rejection at just 80 psi, making it well suited for facilities sourcing cold municipal or well water.

A 1:1 ratio means the system produces one gallon of purified permeate for every one gallon discharged as concentrate waste — a significant improvement over standard 3:1 or 4:1 ratios. This reduces water waste and lowers utility costs over time, particularly for high-volume production environments.

The most reliable indicators are a measurable drop in system flow rate and a rise in output TDS compared to your post-installation baseline. If you're consistently seeing reduced production or permeate quality despite proper pre-filtration using a GrowoniX Green Coco Carbon Filter and regular flushing, it's time to replace the membrane element.

Yes — flushing is required before collecting permeate water from a new membrane. New elements contain a preservation solution that must be fully purged at initial start-up. Use your GX Series manual flush valve to clear the membrane and bring the system up to full operating performance before beginning normal production.