GrowoniX High Flow Replacement Membrane for the EX/GX100-400, 200+ GPD

GrowoniX High Flow Replacement Membrane for the EX/GX100-400, 200+ GPD

SKU #: GXM-200-HF
GrowoniX Brand Product

Availability: In stock

Lead time: In stock items ship within 24 hours

  • Warranty
    1 Year

200+ GPD High Flow Cold Water Membrane for EX100-EX400.

GrowoniX famous 200GPD High Flow membrane, transforming the way customers think about reverse osmosis filtration. This little membrane element is the highest flowing 2" TFC element on the planet. The GXM-200-HF is a great upgrade to lower flowing systems and is a must for the avid gardener who needs control over their water production and nutrient scheduling.

These GrowoniX, American made, hand rolled membranes are the industries most reliable and highest performing reverse osmosis elements in the world. Advanced membrane technology and manufacturing processes ensure superior quality and unmatchable performance. Ultra low energy design delivers high flow and high rejection at only 70psi. A must for cold water sources. Always at an industry leading 1:1 ratio.

Click here to view the GrowoniX Replacement Filter Chart for product compatibility.

Tech Specs


Weight (lb.)1
Height (in.)3
Width (in.)3
Length (in.)13
Warranty1 Year
Prop 65No
Product Q&A

GrowoniX High Flow Replacement Membrane for the EX/GX100-400, 200+ GPD Questions & Answers


How does water temperature effect flow rates through RO filters?
Between 77° and 50° water system production declines by 50%, as cold water is more dense, more viscous, and more difficult to move through the membranes.

What can be done to combat the effects of cold water on RO membranes?
Increasing the water pressure with a booster pump. Increasing the feed water temperature, which some people do by mixing warm and cold water from a diverter valve.


Does the system ratio (waste ratio) change over time?
System ratios can change over time if the flow restrictor starts clogging due to hard feed water conditions.

Does the system ratio change with water temperature?
System ratios (waste ratios) can drift with cold feed water. Water travels the path of least resistance — the drain line! It’s important to check the system ratio during the winter months and adjust if necessary.

How can the system ratio be adjusted?
System ratios can be tuned with a ball valve or Flow Box. Never go lower than the system was intended for.


How much water pressure is needed to run an RO system properly?
RO membranes require 40 psi of incoming pressure to produce even a drop of water except our GXM200-HF which requires only 20PSI. The only membrane on the planet that can do this.

What’s the maximum feed water pressure that an RO system should run on?
Incoming feed water pressure on all water filters, always and everywhere, should be no more than 80psi. Plastic filter housings cannot handle more pressure.


Can all GrowoniX water filters be used with well water?
Well water is generally too dirty for small RO membranes (100GPD through 400GPD systems). The large 4” membranes of the bigger systems (600GPD and larger) are recommended for well water treatment, unless the water demand is really low.

Are there any special filters needed to treat well water?
KDF85/ catalytic carbon filters are a must for well water treatment. This premium catalytic carbon filter with a bed of KDF85 media can reduce iron, hydrogen sulfide, heavy metals, and bacteria—all things that wreak havoc on RO components—especially membranes. Other consideration for special filters can only be deduced with a laboratory water analysis.

Does GrowoniX help with well water analysis?
They do. Just send Growonix your water analysis and they will look at it for free. If you don’t have a recent analysis, you can either use a local water lab, or purchase a test kit through GrowoniX send it off to our partner lab.


Customer Reviews 2 item(s)

Great product
Great product and fast shipping. Water tds went from 250 to 40ppm with new membrane and filters.
Works well. Replaced easily
It works...

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