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GrowoniX EX4000 - 4000 GPD Reverse Osmosis Filtration System

Item #: EX4000

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GrowoniX EX4000 - 4000 GPD Reverse Osmosis Filtration System

Additional Images


Waste Water Ratio

Waste to Filtered

Flow Rate

Per Day

Filter Types

RO Membrane
UV - Optional

Water Pressure
30 PSI


Carbon Filter Life


Designed to flow 4000 gallons per day (167 gallons per hour) of pure RO water with an astounding 1:1 ratio-or better. Massive water production with a mere 110V booster pump! The EX4000- HFT, utilizing a pair of GXM-1000-HF membranes, is an absolute breakthough in efficiency.

Armed with dual KDF85 catalytic carbon filters, the EX4000- HFT has a carbon capacity of 68,000 gallons-which means it can produce 34,000 gallons of ultra pure water at 1:1 ratio (even more if lower system ratio is utilized). Three liquid-filled stainless steel pressure gauges informs when it's time to change the pre-filters. ADDITIONAL CARBON TANK NOT REQUIRED!!! Quick connect fittings all throughout the plumbing allow for fast and easy installation.

A manual flush valve allows you to clean the membrane, purging out pollutants that could otherwise add buildup to the system. Flushing adds considerable life to the membrane as well. A carbon flush valve allows for easy carbon filter flushing after normal filter changes. Utilizing the best membrane technology in the world, the GrowoniX EX4000-HFT is unbeatable at any price.

    Growonix EX4000 Systems Features:
  • 1:1 System ratio can be configured for 1/4:1 (1/4 drain to 1 product water)
  • Super efficient 110V BP6040 pump.
  • 2 High Flow Cold Water Membrane elements.
  • Recycle Flow Box for System Tuning.
  • Dual KDF85 Catalytic Carbon Filters.
  • Carbon Flush Valve
  • Membrane Flush Valve
  • Quick Connect Installation.

Click here to view the GrowoniX Replacement Filter Chart.

Click here to view the GrowoniX Product Guide.

The idea behind the Deluxe Series is simple- All the bells and whistles of a turnkey mini water treatment plant in a compact, affordable, and dependable package. Utilizing the finest components in the water treatment industry. GrowoniX Deluxe Series is a breakthrough in water treatment gear with its componential design, mobility, and unmatchable efficiency. GrowoniX Deluxe Series are available in two different packages- GX-Deluxe and EX-Deluxe. Both packages are built equally with the highest quality components and perform exactly the same. The GX Deluxe packages come with the full monty-a custom roller chassis and Splash Guard pump chassis. The EX Deluxe package leaves behind the fancy metal fabrication for a more economical price-never before has commercial grade water filtration been this affordable. Both EX and GX Deluxe Systems come with ultraviolet filters, tank float switches, input solenoid valves, and SCH80 input plumbing-everything you need start making tons of water.


Brand GrowoniX
SKU EX4000
Weight (lb.) 60
Height (in.) 40
Width (in.) 20
Length (in.) 20
Warranty Yes
Free Shipping Yes
CSA Listed No
ETL Listed No
UL Listed No
Gallons Per Hour 167
GPD 4000+
Min. NACL Rejection 98%
Min. Feed Pressure 30 PSI
Recommended Feed Pressure 60 - 80 PSI
System Ratio 1:1
Operating Temperature 40°F - 105°F
Operating pH 3 - 11
Nominal % Rejection 98.5%
Max TDS 2000 ppm
Max Hardness 15 gpg
Amps 5.5A
Voltage 110V

GrowoniX EX4000 - 4000 GPD Reverse Osmosis Filtration System 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.

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