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GrowoniX Flow Box 600

Item #: FLOWBOX600

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GrowoniX Flow Box 600

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GrowoniX FlowBox is a componential add-on to any EX/GX600/1000 GPD and above that utilizes a BP Series booster pump.

Why Use a Flow Box?

  • Allows for adjustable system ratio
  • Accurate monitoring of membrane performance and longevity
  • EZ membrane flush with a single twist of the valve
  • Allows for recycling (Recycler unit only)

Equipped with highly accurate liquid flow meters, the FlowBox allows for custom tuning and fine-tuning of the system ratio. Run your system at any ratio from 3:1 to 1/4:1- whenever you want. System ratios change throughout the year as the weather temperatures change. Keep a perfect 1:1 or better, all year round, with a FlowBox. Flush the system with a simple twist of the stainless steel needle valve. Allows for removal of the standard drain/flush assembly. Mounts atop the EX/GX series chassis for easy viewing and adjusting. Easy wall mounting as well.

  • Stainless steel high pressure needle valves
  • Precision flow meteres
  • Wall mountable electrogalvanized brackets
  • Available on standard or recycling configurations

Not sure what product you need for your system? Click the links below for GrowoniX system compatibility.

Click here to view the GrowoniX Replacement Filter Chart.

Click here to view the GrowoniX Product Guide.


Brand GrowoniX
Weight (lb.) 12
Height (in.) 10
Width (in.) 10
Length (in.) 10
Free Shipping Yes
CSA Listed No
ETL Listed No
UL Listed No

GrowoniX Flow Box 600 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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