If your RO/DI system is just not producing water at the rate it should be or you find yourself burning through DI resin much faster than normal, adding an RO/DI booster pump with auto flush flow restrictor might just be the ticket to get your tap water filtration back on track. 

Why Do I need a Booster Pump and Auto Flush Flow Restrictor?

When an RO/DI system is not receiving optimal input water pressure, the membrane is not able to produce water as efficiently.  A booster pump will increase incoming water pressure and improve the performance of your membrane - the ideal water pressure going into your RO/DI system is 50+ PSI. Anything lower than 50 PSI means your not producing water as efficiently as possible. 

Over time, your RO membrane becomes clogged with contaminants that it removes from your tap water which ultimately reduces the performance of the RO membrane and can result in accelerated DI resin exhausting. An auto flush flow restrictor will automatically flush those contaminants away from your membrane every time your produce water so that your membrane can filter the water optimally.

Equipment Needed

  1. Booster Pump
  2. Auto Flush Flow Restrictor Kit

When installing a booster pump and Auto Flush at the same time, it is best to purchase the appropriate auto flush flow restrictor Kit based on your system's production rate and then purchase the booster pump separately. The single transformer included with your auto flush flow restrictor Kit will power the booster pump and connect to your Auto Flush and Pressure Switch; you do not need two transformers. 

1. Mount the Booster Pump

Decide where to mount your booster pump which should be screwed into a solid surface. On the wall next to your RO/DI system is the most common location but a shelf is OK too. 

2. Connect the Booster Pump

The booster pump goes in between your tap/source water connection and RO/DI system input so it can increase the pressure of water as it enters the RO/DI system.

    1. Turn off source water going into RO/DI system.
    2. Cut the red water line going into your RO/DI system.
    3. Reference the flow arrow on the front of the booster pump which indicates the flow of water.
    4. Connect the red tubing coming from your tap water source to the inlet side of the booster pump.
    5. Connect the red tubing going into your RO/DI system to the outlet side of the booster pump.

Watch Video: Installing a Booster Pump on a Reverse Osmosis System - BRStv How-To

3. Connect the Auto Flush Flow Restrictor

You will first need to remove the existing barrel style flow restrictor from your BRS RO/DI System. Disconnect the black tubing from each side of the existing barrel restrictor and install the auto flush flow restrictor in its place. Use the arrows on the Auto Flush to indicate the flow of water.  Water flows OUT of your membrane, through the restrictor, and down the drain. 

4. Install Pressure Switch (optional)

The pressure switch is technically optional but is really nice to have because it automates the booster pump and auto flush operation. It's applicable to RO/DI systems that are controlled with a float valve in the freshwater reservoir but can also work if you have a ball valve on your RO/DI product water line that is used to control production. 

Automatic Shut Off: When the float rises (or the ball valve is closed) pressure begins to build in the RO/DI system water lines, the pressure switch senses this pressure build-up and shuts down the power to your booster pump and auto flush.

Automatic Turn On: When the float valve drops/opens (or you open the ball valve manually) the pressure in the water line is released, the pressure switch senses the drop in pressure and will return power to the booster pump and auto flush then begin producing water as needed. Please Note: An ASO - Auto Shut Off Valve is required for automated function. All BRS RO/DI systems come with an ASO valve installed. 


    1. Cut the blue product water line coming out of your RO/DI system before the float valve.  It's best to place the pressure switch within 12" of the output connection so the wires are easily within reach of the transformer connection wires.
    2. Attach the blue tubing to each side of the pressure switch.  There is no proper direction or flow arrows to reference, the orientation doesn't matter. 
    3. Water coming out of your RO/DI system should now flow through the pressure switch before going into your float valve (or ball valve). 

If your wish to forego the pressure switch and automated operation, you will need to manually plug in your booster pump transformer every time you wish to produce filtered RO/DI water. 

5. Connect Wires

Follow the diagrams accordingly for the proper wiring configuration. The white male/female connectors simply plug into each other and don't require any special tools or soldering. Do not plug in the transformer to power until you have connected all of the plugs and verified everything is connected correctly. Secure the wires away from the risk of water drips before plugging in the transformer.

Click image to enlarge

Wiring Booster Pump and Auto Flush with Pressure Switch
Wiring Diagram for Booster Pump and Auto Flush
Wiring Booster Pump and Auto Flush without Pressure Switch
Wiring Diagram for Booster Pump and Auto Flush