Why Is My Reverse Osmosis System Making Noise?

It is not uncommon for a reverse osmosis system to make noise. This can be because of the pressure pump, the membrane cleaning process, or even the incoming water supply line if it is too aggressive. The noise from your reverse osmosis system could also be caused by an air leak somewhere in the system, including at one of the fittings, valves or pipes. The noise from the system may also be more loud when the water pressure is higher than normal.

Noise coming from a reverse osmosis (RO) system can be caused by a few different factors. Most of the time, these noises are related to water pressure or air in the system, but they can also be caused by other issues such as mineral buildup and leaks.

Why Is My Reverse Osmosis System Making Noise?

Why Is My Reverse Osmosis System Making Noise
Reverse Osmosis System
Bubbles Accumulating Inside The System
Bubbles Accumulating Inside The System

Bubbles Accumulating Inside The System: You may hear a bubbling noise coming from your reverse osmosis system if there is an accumulation of air bubbles inside the unit. This can happen when the water pressure is not regulated correctly, or when the intake line has become clogged with sediment.

A Change In Pressure
Checking Pressure

A Change In Pressure: One of the most common causes of noise in a reverse osmosis system is a change in pressure. This can happen when the water enters the system, or when it passes through the membranes. When this happens, air will be released and cause a loud popping sound. To solve this issue, make sure that your RO membrane is not overfilled with water.

Faulty Parts
Faulty Parts of filter

Faulty Parts: Another possible cause of noise could be faulty parts or components. This is especially true if your reverse osmosis system is old or has been in use for a long time. In this case, it may be necessary to replace the inlet valve, pressure relief valve, and other components that could be causing the noise.

High water pressure
High water pressure of RO

High water pressure: If the water pressure to your Reverse Osmosis System is too high, it may cause a loud banging noise. The best way to diagnose this issue is to check the inlet pressure of your system which should be 40 psi or less. If the pressure is higher than this range, you will need to install a pressure regulator or reduce the water pressure from the main supply line.

Air Discharge Valve
Air Discharge Valve of RO System

Air Discharge Valve: If you have an older Reverse Osmosis System that is making a loud banging noise, it could likely be caused by air in the system. This can usually be fixed by opening and closing the air discharge valve several times to get rid of any built-up pressure or trapped air.

Motor or Pump Noise
Motor of RO

Motor or Pump Noise: If your reverse osmosis system is making a loud noise that resembles a motor or pump sound, it’s likely due to the main pump not being lubricated. You should consult with an experienced plumber who can properly diagnose and repair this issue.

Faucet Noise
Faucet Noise of water

Faucet Noise: If you hear a loud banging noise coming from your tap when the Reverse Osmosis System is running, it could be caused by a water hammer. A water hammer occurs when the pressure in the pipe suddenly changes and can be corrected with an air chamber or water hammer arrestor.

System continuously running to drain
Drain RO System

System continuously running to drain: A common issue with reverse osmosis systems is that the system runs continuously in order to drain. This is caused by a blockage or improper installation of the drain, which causes water to remain in the system. The noise you hear from your reverse osmosis system could be due to water running through the pipes or even air bubbles being released.

How To Check If Your Auto Shut-Off Valve Is Working Correctly?

1. Make sure the water pressure is sufficient:  You should check the water pressure at your tap to make sure it is within the range specified by your reverse osmosis system manufacturer. Low water pressure will cause a noisy system.

Look for any sediment buildup in the tubing
Sediment buildup in the tubing

2. Look for any sediment buildup in the tubing:  If you see any sediment buildup in the tubing, it could be restricting the flow of water and cause a noisy system.

Check the Auto Shut-Off Valve
Auto Shut-Off Valve

3. Check the Auto Shut-Off Valve:  If your reverse osmosis system has an auto shut-off valve, make sure it is working correctly. An auto shut-off valve that isn’t functioning properly can cause pressure to build up in the system, leading to a noisy system.

4. Test the water pressure and flow:  Test the water pressure and flow of your reverse osmosis system by running it for several minutes. If you notice any sudden changes in noise level or water pressure, this could indicate an issue with your reverse osmosis system that needs to be addressed.

How To Check If Your Reverse Osmosis Systems Check Valve Is Working?

Check the check valve

1. Check the check valve: The first thing to do is to make sure that your reverse osmosis system’s check valve is working properly. The purpose of a check valve is to prevent contaminated water from flowing back into the clean water supply, and so it should be checked regularly.

Listen for noise
checking valve is not working correctly

2. Listen for noise: If the check valve is not working correctly, it can cause a loud buzzing or humming sound. This noise will usually be louder when you are using more water than usual, such as when you are running the dishwasher or taking a shower.

3. Check for leakage: Additionally, if your check valve is failing, you may also notice that water is leaking out of it. If this happens, you should replace the valve as soon as possible to ensure that your reverse osmosis system continues to perform at its optimal level.

4. Replace if necessary: If you’ve determined that the check valve is not working properly, it’s important to replace it with a functioning one as soon as possible. Fortunately, it’s relatively simple to do so and the parts are widely available online or in hardware stores.

Prevention of Water Softener Tank Overflow

  • Regular maintenance: It is important to check your reverse osmosis system regularly for any signs of damage or blockages. This means that you should inspect the entire system for any leaks or debris, and clean out any sediment build up that may be causing problems. You should also check the pressure relief valve on a regular basis and replace it if necessary.
    Regular maintenance
    Regular maintenance of RO
  • Regular inspection and cleaning: Inspect your reverse osmosis system on a regular basis for signs of wear and tear. Look for any visible damage to the hoses or fittings, as well as any foreign objects that could be blocking the flow of water. Clean the filter cartridges and replace them when necessary. Make sure everything is properly connected and functioning correctly.
  • Monitoring of system settings: It is important to check the system settings regularly, ensuring that all components are functioning properly. This includes checking the pre-filter and post-filter pressure, flow rate, water temperature, TDS levels, pH levels and any other relevant parameters. If any setting is too high or too low than what it should be in order to ensure proper operation, then the system may start producing strange noises. It is a good idea to check these settings at least once a month to ensure everything is running smoothly and efficiently.
    Monitoring of system settings
    Monitoring of system settings
  • Use of quality resin beads: The resin beads used in the system are of utmost importance. Poor quality beads can create a lot of noise due to frequent agitation from water passing through them. Replacing these with higher-grade beads will reduce the noise levels significantly.


Why does my reverse osmosis water taste funny?

Why does my reverse osmosis water taste funny
Reverse osmosis water taste funny

Reverse osmosis systems use a process called reverse osmosis, which is the opposite of regular osmosis. During this process, mineral content in the water is filtered out and left behind on a semi-permeable membrane. As a result, the remaining water contains fewer minerals than before and can have an altered taste. To improve the taste of your reverse osmosis water, you can add a mineral filter to the system or buy bottled mineral water.

Is reverse osmosis drinking water acidic?

Is reverse osmosis drinking water acidic
Drink RO Water

No, reverse osmosis drinking water is not acidic. The process of reverse osmosis does not produce an acidic product; rather the pH remains the same as that of the source water. However, depending on your specific system and local water conditions, it is possible for the final product to have a lower pH than source due to other factors. When noise is present, it is usually due to air being trapped in the system and released as bubbles through the faucet.

Why is my reverse osmosis hissing?

Why is my reverse osmosis hissing
Membrane of Reverse Osmosis

reverse osmosis systems that is often caused by air entering the system. As the water passes through the membrane, it leaves behind small amounts of air that can build up and create a hissing sound. This usually happens when there is not enough water passing through the system to flush out the air from storage tanks, or when the air gap faucet is not functioning correctly.

Why is my reverse osmosis not working?

Why is my reverse osmosis not working
Reverse osmosis not working

Sometimes, reverse osmosis systems can make noise. This could be caused by a few different things. If you hear a humming sound, it might mean that the pump is working too hard to push water through the membranes in your system. You may need to replace the filter or clean out any debris from the system to stop this type of noise.


Noisy reverse osmosis systems are usually caused by either air bubbles or water pressure. If your machine is making an excessive amount of noise while in operation, it’s important to identify the source of the issue and make necessary repairs so that you can keep enjoying clean drinking water. To prevent noise from occurring in the first place, regular maintenance of the unit is recommended. This includes cleaning and replacing filters as needed, checking for any clogs or leaks, and repairing any damaged parts that may be causing problems.

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