GrowoniX GXM-200-HF 200 GPD High Flow Replacement Membrane

The GXM-200-HF is a direct drop-in replacement for the GX150, GX200, GX300, 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 Flow (HF) version is optimized for maximum water production at 200+ GPD and is the most popular choice for most grow operations. The High Rejection (HR) version — such as the GXM-150-HR — produces a lower output TDS at a slightly reduced flow rate, making it the better fit when source water quality is poor and the purest possible permeate is the priority.

Standard RO membranes lose flow rate and rejection efficiency as water temperature drops. The GXM-200-HF was engineered specifically for cold water performance, maintaining consistent output in low-temperature source water conditions — a common challenge in grow facilities sourcing cold municipal or well water.

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 with a GrowoniX Sediment Filter and a GrowoniX Replacement Carbon filter, it is time to swap in a new membrane element.

The GXM-200-HF operates at a 2:1 waste ratio — the same ratio built into the GX Series system design. Replacing a spent membrane with a fresh GXM-200-HF restores the system to its rated efficiency without altering the plumbing configuration or waste output.

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 before beginning normal production.