What is a Flow Restrictor for Reverse Osmosis?

A flow restrictor is an important part of a reverse osmosis system. It is a special device that restricts the amount of water flowing through the unit. This helps to ensure that the system does not produce more waste water than needed.

A flow restrictor is typically installed in the feed water line between the inlet and outlet valves on your reverse osmosis system. It will be installed before any other line filters or softeners are added to your system. You can easily see it on your RO system as it will be located right after your faucet and right before any other components of your RO unit.

It is usually made out of white plastic and has a small hole in it. Water flows into this hole and then into the RO system. The flow restrictor is a one-way valve that only allows water to pass through, and not back out.

Flow restrictors are used in many other applications where pressure needs to be controlled, such as fire sprinklers and air compressor systems. They can also be used in your home when you need to limit the amount of water flowing into your irrigation system or sprinkler system.

What is a Flow Restrictor?

A flow restrictor is a device that slows down the flow rate of water through your reverse osmosis system. It is installed between the faucet and the reverse osmosis membrane. The flow restrictor is used to reduce pressure on the membrane, which can help extend its lifespan.

Flow Restrictor for Reverse Osmosis System

How Does a Flow Restrictor Work?

The flow restrictor is simply a little plastic disk with small holes drilled into it. The disk sits between the faucet and your reverse osmosis membrane, so that water flows through the disk before it flows through the membrane.

What Are Some Benefits of Using a Flow Restrictor?

  1. It can increase your RO system’s lifespan by reducing the pressure on the membrane.
  2. It can help reduce the amount of waste water your system produces, which will save you money on your monthly water bill.

How Do I Install a Flow Restrictor?

  1. First, turn off your RO system by closing the faucet at the RO faucet outlet. This will block all water flow through the RO membrane and prevent any reverse osmosis waste water from being drained into your sink drain. You should also disconnect your garden hose or any other source of water that’s connected to your home’s plumbing system, so that no other plumbing lines are draining into the sink drain while you are working on installing the flow restrictor.
  2. Next, unscrew the faucet nut that is used to connect your RO faucet to the water supply (this may require a wrench).
  3. Pull the faucet off of the water supply line.
  4. Use pliers or a wrench to remove the plastic nut that is situated between your RO membrane and your water supply line.
  5. Use pliers or a wrench to remove the plastic nut that is situated between your RO membrane and your faucet. This will allow you to easily insert and remove your flow restrictor without having to disconnect any plumbing fittings.
  6. Insert the flow restrictor into the space where you removed both of those plastic nuts in step 5.
  7. Screw the flow restrictor into place, ensuring that it is on tight.
  8. Reattach the RO faucet to your membrane, and reattach your membrane to your water supply line.
  9. Reconnect the garden hose or any other source of water that was connected to your home’s plumbing system in step 1 so that no other plumbing lines are draining into the sink drain while you are working on installing the flow restrictor.
  10. Turn on the tap so that water begins flowing through your faucet and out of the RO faucet. Turn on any other sources of water that were turned off in step 1. Make sure there are no leaks from any connections.

Where Does Flow Restrictor Go on RO System?

The flow restrictor should be located between the RO membrane and the faucet that is being used to dispense purified water. If you are dealing with a single-stage system, this will usually mean either the faucet that is connected directly to your RO membrane or the faucet that is installed directly after your RO system. On a three-stage system, it will usually be located between the first and second stage of purification or after the third stage of purification.

How Do I Choose the Right Flow Restrictor for My Reverse Osmosis System?

There are two different types of flow restrictors that can be used on reverse osmosis systems. The first type is a mechanical flow restrictor. These are usually made from plastic and will come in a variety of different sizes, ranging from 0.5 GPM to 10 GPM. They are very easy to install and usually come with the necessary fittings for installation.

The second type is an electronic flow restrictor. These types of flow restrictors will not only limit the amount of water that flows through the system, but they will also signal your RO membrane to shut down automatically if there is a problem with it or if it needs maintenance. If you need to replace your flow restrictor, you should always use one that is electronic.

Here are some of our favorite top-rated RO flow restrictors:

How Does a Flow Restrictor Work?

A flow restrictor is just a simple device that limits the amount of water that flows through your reverse osmosis system. They come in different sizes and styles, but they all work in the same way. One end of the restrictor will have a threaded fitting that matches the fittings on your RO system. The other end will have an opening with a valve inside it. This valve can be opened or closed to control the amount of water that flows through your reverse osmosis system.

When to Change the Flow Restrictor?

The flow restrictor can become clogged over time. This will cause a restriction in the system and reduce the amount of water that flows through the RO membrane. If you find that your RO system is not producing as much water as it used to, or if you find that your faucets are not providing good pressure and volume, then you may need to replace your flow restrictor.

There are a few other reasons why you should change it:

You can check for clogging by removing the flow restrictor and pouring water through it. If there is a restriction in the flow restrictor, then water will start to come out of one end or both ends. You will also notice that there is more resistance when you try to push water through the restrictor.

You can also check for clogging by placing a pressure gauge on the RO system and monitoring the pressure gauge as you open up the flow restrictor. If you see that there is an increase in pressure when you open up the flow restrictor, then your flow restrictor may be clogged.

You should change your flow restrictor if it has become clogged or if you want to increase the amount of water that passes through your RO membrane. Remember though, that changing your flow restrictor is not recommended if you have a low TDS level and do not want to lose it. In this case, change only when necessary.

RO Flow Restrictor value calculation

What if I use a Flow Restrictor of a Higher or Lower Capacity?

If your RO system is too small for the flow restrictor, then the water may not pass through the membrane properly. If you have a large flow restrictor and a small RO system, then the pressure in your RO unit will be too high.

It is best to use a flow restrictor that is just right for your system.

How do you know if RO flow restrictor is bad?

There are a few ways to tell if your flow restrictor is bad. First, you can monitor the pressure gauge on your RO system as you slowly open up the flow restrictor valve. If you see that there is an increase in pressure as you open up the valve, then it may be time to replace your flow restrictor.

Another way to check to see if your flow restrictor is bad is to connect a TDS meter on your RO system and monitor the readings as you slowly open up the flow restrictor valve. If you see that there is an increase in TDS level as you open up the flow restrictor, then it is time to replace the flow restrictor.

You can also check for leaks in the flow restrictor by using a cleaning solution made of 50% vinegar and 50% water. You can use this solution to look for leaks on your flow restrictor as well as other parts of your RO system.

How Do I Adjust My Ro Flow Restrictor?

In order to adjust the flow restrictor, you need to shut off the water supply to your RO system. Then you can slowly open up the flow restrictor until you arrive at a level that is just right for your system.

Conclusion

Flow restrictors are a very important part of your RO system. It is important to have the right flow restrictor for your RO system. If you get the wrong flow restrictor, then you can damage your RO membrane, which will shorten the life of your membrane and could even ruin it completely.

Meet the author: Paul White

Paul is water engineer by trade and is very passionate about innovative solutions for water filtration. His goal is to make drinking water accessible and affordable to all. An avid runner, he is currently training for a marathon. “Running is my sanity. Writing is how I organize my thoughts. I’m a poet and writer who is passionate about change. I aspire to be the best version of myself, and to help others do the same.” Learn more about Paul and the rest of the team.