How to Reset the Flow Restricter on the RO4000 for Fast Flowing Waste Water Hose [VIDEO]

In this article, you’ll learn how to easily reset the flow restrictor on the RO4000 Reverse Osmosis system for fast-flowing water.

If you happen to experience a block in water flow using your RO4000 Reverse Osmosis system, there is an easy fix. This can occur when some debris is caught inside the system or with a brand new product that hasn’t been flushed yet.

Whether your system is brand new or you’ve had it for a while, you will know exactly how to fix this issue.

RO4000 Hoses

Firstly, it is helpful to know which hose performs which function.

Blue Hose = Pure Water

Black Hose = Waste Water

Inside the Reverse Osmosis system, there is a flow restrictor.

The RO4000 Flow Restrictor


The purpose of the Flow Restrictor is to stop too much water from going to waste through the black pipe, and it pushes more pressure on the membrane, evening up the water flow.

We end up having about a 50/50 waste/pure water ratio. A litre of water waste goes through the black pipe, and a litre of pure water collected, coming through the blue pipe.

In this situation (in the video above), the knob on top of the flow restrictor was stuck on.

Unfortunately, as a result, nearly 100% of the water coming into the RO system is going to waste through the black hose. 

The Simple Solution

With the tap in the off position, you will need to disconnect the blue and black outlet hoses and let them hang into the sink.

Next, take the top off your RO system.

Turn the water on, and observe the difference in flow coming from each hose.

The correct balance is 50/50, as mentioned above. Therefore, 50% of your water will go to waste (black), and 50% is for keeping (blue).

Flushing Your Unit

If you have confirmed your hose is blocked, follow the process below to remedy it:

Having removed both outlet hoses (blue and black), let them hang into the sink while pumping the flush button a handful of times. The flush button is located on top of your system.

You should start to see the system starting to pressurise, and it’s starting to work correctly.

If this does not fix it, please feel free to contact us. We would be delighted to help troubleshoot the problem with you.

Click here to read more about the RO4000 Reverse Osmosis System.

Category-reverse osmosis water filter systemsType-care and repair