Reverse osmosis tanks and systems are now a widespread application in most houses. Thanks to their incredible ability to clean normal water, our day-to-day lives have become a lot healthier.

How To Pressurize a Reverse Osmosis Tank?

Unfortunately, these fantastic filters sometimes come across a few problems. One such issue is that the water flow rate gets low with time. In that case, pressurizing the system is essential. Through this post, let’s look at how to pressurize reverse osmosis tank and many other related things.

Why Does my Reverse Osmosis System Run Out Of Water?

If it doesn’t get filled up, your reverse osmosis system might run out of water. This can happen because of cloggings in the reverse osmosis membrane.

When your reverse osmosis system’s membrane isn’t replaced when the time comes, the trapped dirt on the membrane can prevent water from flowing through it into the storage tank. If this happens, remove all the water in the tank and replace the reverse osmosis membrane and the reverse osmosis tank will work back as usual.

An empty RO tank has a pressure of 6 to 8 PSI. As the water fills and presses against the air chamber, the pressure gradually increases – the increased pressure decreases as the water flows back. Most RO units have an automatic shutoff function when the pressure inside the tank reaches 2/3 the pressure of the water flowing from your main line into the RO system. When the tank pressure reaches about 30 PSI, the system turns off water production.

Sometimes, there can be other reasons that might affect the water flow into the tank. To check, try depressurizing the air valve to see if the tank is broken or has pressure problems. If you see water coming out, it means that there is a hole in the bladder, and the tank needs to be replaced.

Do I Need To Pressurize Reverse Osmosis Tank?

Pressurize a reverse osmosis tank

Maintaining pressure inside a reverse osmosis system in the proper range is essential. This pressure plays a significant role in the water flow rate from the RO tank. Slow water flow rates can be very displeasing and uncomfortable to work with.

Inside the RO accumulator, there are two compartments: the water compartment and the gas compartment. Prevents the air from being pressurized, and when you open the faucet, the air will push over the water and flow out through the faucet.

What is The Correct Pressure For Reverse Osmosis Tank?

A fully working reverse osmosis tank should have 7 to 8 psi pressure when the tanks are empty. It is imperative to maintain this pressure and affect the efficiency of the reverse osmosis tank. The water pressure inside the tank, when full, should be 30 psi. Once this value is exceeded, the reverse osmosis filter stops water production. 

Every reverse osmosis water filter should maintain these pressure values within the tank to make sure that the water flows out of the tank smoothly without any issues. Besides, free-flowing water will be more favorable to drinking since this water is thoroughly filtered by the reverse osmosis system, making them taste much better.

Re-pressurizing a reverse osmosis storage tank, will be pretty easy if you follow the below steps.

How To Pressurize a Reverse Osmosis Tank?

How To Re-pressurize A Reverse Osmosis Tank?

Total Time: 12 minutes

Remove Water Supply

remove water supply

Remove the water supply from the reverse osmosis system and make sure no water remains inside.

Drain Water

drain the water

Open the faucet to drain all the water from the tank until it is completely empty. When the water flowing completely stops, it means that the tank is empty.

Remove Liner From the Valve

Find the valve body and remove the liner. Please note that there are two valves – the air pressure valve and the other goes to the reverse osmosis membrane. Make sure not to remove the valve going to the reverse osmosis membrane.

Check PSI

check the PSI

Check your tank pressure with a PSI gauge. The ideal pressure for an empty tank should be between 6 and 8 PSI for a 24-gallon tank.

Pump in Air if Necessary

If the PSI is less than 6, use a bicycle pump or an air compressor to pump air into the valve until the PSI reaches 67. Be careful not to overpressurize.
At this point, you can see that some water is coming out of the tank. It is acceptable. Continue adding air pressure until the water stops, then check the PSI.

Check or Correct PSI and Repeat if Necessary

Once the PSI is normalized, close the valves and faucets and allow the water from the membrane to flow back into your sump.
Your reverse osmosis filter tank will now work back as it always did.

Estimated Cost: 25 USD


  • Bucket


  • Wrench
  • Pliers
  • Air Pump or compressor
  • PSI Gauge

Materials: Plumber Putty


Pressurizing a reverse osmosis system or tank is very easy if you follow up the steps correctly. Always be extra careful when doing this to prevent any possible damages.

Pressurizing and maintaining proper pressure within the tank is very important to use the reverse osmosis system for a long time. If the pressure inside the tank is not maintained correctly, this might cause internal problems, resulting in low water pressure, no water, incorrectly filtered water, and many others. Maintaining the reverse osmosis tank is equally important as the Maintainance of every other piece of equipment and affects the long-term use.


Why is my reverse osmosis tank not filling up?

One of the most common reasons a reverse osmosis tank doesn’t fill up is that it is clogged. This happens when the reverse osmosis membrane needs to be replaced. Once the reverse osmosis membrane is replaced, the revere osmosis tank will fill up as it always did.

How do you fix low pressure in reverse osmosis tanks?

Fixing low water pressure is done in the same way as re-pressurizing the reverse osmosis tank as mentioned above. All you have to do is follow up the steps and carefully pressurize the water system.

Cleaning or replacing the reverse osmosis membrane can also sometimes help.

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