GrowoniX 150+ GPD Replacement Membrane for EX200/GX200 & GX300/400

The GXM-150-HR is a direct drop-in replacement for the GX200, GX400, EX200, EX400, and EX400-T systems. It is not compatible with the larger GX1000 or EX1000 series housings — confirm your model against the compatibility list before ordering.

The High Rejection (HR) membrane prioritizes the lowest possible output TDS over maximum GPD throughput. It's the right choice when source water quality is poor or when nutrient mixing demands a precise baseline TDS. If maximum flow rate is the priority, the High Flow (HF) version is the better fit.

RO membrane performance typically drops as water temperature decreases. The GXM-150-HR's ultra-low energy design is specifically engineered to sustain high flow and high rejection at just 70 psi—often achieved with the help of a GrowoniX booster pump—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 cuts water waste by up to 75%, reducing utility costs over time.

The two 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, it's time to replace the membrane element.

Yes — flushing is required before putting a new membrane into service. New elements are shipped with a preservation solution that must be fully purged before permeate water is collected. Use your GX Series manual flush valve during initial start-up to clear the membrane before beginning normal production.