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White Growonix GXM-1000-HF RO membrane with blue logo and text.

GrowoniX GXM-1000 1000 GPD Replacement RO Membrane

Official GrowoniX Dealer Model: GOGXM-1000-HF
$439.52 USD$399.52 USD$439.52 USD
 $439.52 USD
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  • 1000 GPD rated output capacity for consistent filtration volume.
  • Direct drop-in design compatible with EX1000 and GX1000 series housings.
  • Industry-standard 4 inch by 21 inch dimensions for simple installation.
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THROUGH THE Cultivator's LENS Hands-On Evaluation

Who This Is For

  • You are swapping your RO membrane because your current output TDS is creeping up and threatening your nutrient balance.
  • You are stocking up on replacements because your facility cannot afford a drop in water production during a harvest cycle.

What We Found

  • Keep a spare on the shelf because waiting for shipping when your system hits its limit puts your schedule at risk.
  • The High Flow version works great for most, but choose High Rejection if your municipal water arrives heavy on salts.

What Users Say

  • Users who track their input and output quality say switching out the membrane periodically kept their TDS levels stable.
  • Growers who run high-demand systems say they stopped fighting nutrient lockout after swapping to the HR configuration.

GrowoniX GXM-1000 1000 GPD Replacement RO Membrane

Membrane performance degrades over time, and running a worn element means paying for water production you're not getting. The GrowoniX GXM-1000 is the direct replacement membrane for the GX1000 and EX1000 series RO systems, available in two configurations to match your specific water quality and flow rate priorities. The High Flow (HF) version delivers unmatched throughput at 1000 GPD and is the most popular choice for high-demand grow operations. The High Rejection (HR) version trades a modest reduction in flow rate for ultra-high rejection, producing the cleanest possible permeate where input water quality is a concern.

Both versions are sized at 4" x 21" and drop directly into EX1000, EX1000-T, and GX1000 system housings without modification. Replacing the membrane on schedule is the single most cost-effective maintenance step you can take to protect the rest of your filtration system and maintain consistent output quality. To ensure you reach the full rated flow capacity, we recommend pairing this membrane with a GrowoniX BP-1000 HF Adjustable Booster Pump to maintain optimal operating pressure.

Features

💧
1000 GPD Flow Rate

The GXM-1000 HF element is rated for 1000 gallons per day, restoring full system output capacity when swapped into a GX1000 or EX1000 housing.

⚗️
HF & HR Configurations

Choose High Flow for maximum throughput or High Rejection for the lowest possible output TDS — both versions fit the same housing with no hardware changes required.

🔁
Direct Drop-In Replacement

The GXM-1000 is purpose-built for the EX1000, EX1000-T, and GX1000 systems — a straightforward swap that requires no tools or housing modifications.

📐
4" × 21" Industry-Standard Size

Standard 4" × 21" form factor engineered to GrowoniX tolerances, ensuring a proper seal and consistent performance inside the GX Series membrane housing.

Specifications

Specification Value
Filter Size 4" × 21"
Membrane Flow Rate 1000 GPD
Available Versions High Flow (HF), High Rejection (HR)
Compatible Systems EX1000, EX1000-T, GX1000

FAQs

What is the difference between the High Flow and High Rejection versions? +

The High Flow (HF) version is optimized for maximum water production at 1000 GPD and is the most popular choice for most grow operations. The High Rejection (HR) version produces a lower output TDS — ideal for situations where source water quality is poor and the purest possible permeate is the priority, though at a slightly reduced flow rate.

Which GrowoniX systems is the GXM-1000 compatible with? +

The GXM-1000 is a direct replacement for the EX1000, EX1000-T, and GX1000 reverse osmosis systems. It is not interchangeable with smaller GX Series membrane housings — refer to GrowoniX's Filter Replacement Guide to confirm the correct membrane for your specific model.

How often should I replace the membrane? +

Membrane lifespan varies based on source water quality, usage volume, and how consistently the system is flushed. A common indicator that replacement is due is a measurable drop in flow rate or a rise in output TDS compared to baseline readings. Regular membrane flushing using the GX Series flush valve significantly extends service life.

Does the GXM-1000 require any tools or modifications to install? +

No modifications are required. The GXM-1000 is a drop-in replacement sized specifically for the GX Series 4" × 21" membrane housing. The installation process involves shutting off the system, depressurizing, removing the spent element, and inserting the new one — no special tools needed.

Should I flush the new membrane before putting it into service? +

Yes — flushing a new membrane before use is strongly recommended. New membranes contain a preservation solution that should be purged prior to collecting permeate water. Use the GX Series manual flush valve during initial start-up to clear the element and bring the system up to full operating performance.

Will swapping from HF to HR (or vice versa) affect my system's waste ratio? +

The system's 2:1 waste ratio is a function of the GX Series design and plumbing configuration, not the membrane version selected. Switching between HF and HR primarily affects output flow rate and permeate TDS — the overall system ratio and efficiency remain consistent regardless of which membrane version is installed.

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