Reverse Osmosis Tank Pressure: Everything You Need to Know

Reverse Osmosis Tank Pressure: Everything You Need to Know

Reverse osmosis tanks and systems are now common in most houses. They are able to clean normal water, making our lives healthier.

Unfortunately, these filters sometimes have a few problems. One such problem is that the water flow rate gets low over time. If this happens, you will need to pressurize the system. In this post, we will look at how to pressurize a reverse osmosis tank and many other related things.

Why Does my Reverse Osmosis System Run Out Of Water?

If your reverse osmosis system doesn’t have any water in it, the system might stop working. This can happen because of clogging in the reverse osmosis membrane. If the membrane isn’t replaced when it needs to be, 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 your reverse osmosis system will work like normal again.

The pressure in an empty RO tank is 6 to 8 PSI. As water fills the tank 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 of the pressure of water flowing from your main line into the RO system. When the tank pressure reaches about 30 PSI, water production shuts off.

There can sometimes be other reasons that affect the water flow into the tank. To check, try to depressurize the air valve to see if the tank has pressure problems. If you see water coming out, it means that there might be a hole in the bladder and you might need to replace the tank.

Do I Need To Pressurize Reverse Osmosis Tank?

Maintaining the pressure in a reverse osmosis system is important. The pressure affects how fast the water flows from the tank. If the water flow is too slow, it can be unpleasant and uncomfortable to work with.

The RO accumulator has two compartments: the water compartment and the gas compartment. This stops air from being pressurized, and when you open the faucet, the air pushes over the water and comes out through the faucet.

What is The Correct Pressure For Reverse Osmosis Tank?

Reverse osmosis tanks need to have 7-8 psi of pressure in order to work properly. This pressure is important and needs to be kept at this level in order for the tank to function correctly. When the tank is full, the water pressure inside should be 30 psi. If the pressure exceeds this amount, then reverse osmosis production will stop.

Every reverse osmosis water filter needs to keep these pressure values inside the tank so that the water flows out smoothly and without any problems. Plus, if the water flows out smoothly it will taste better because it will have been filtered by the reverse osmosis system. If the pressure ever falls below these levels, you can easily re-pressurize the tank by following these steps.

Remove Water Supply

Remove the water supply from the reverse osmosis system and verify that no water is inside.

Drain Water

Open the faucet to drain all the water from the tank. Keep draining it until you see that no more water is coming out. When you’re sure that the tank is empty, turn off the faucet.

Remove Liner From the Valve

Find the valve body and remove the liner. 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 pressure in your tank using a PSI gauge. The ideal pressure for an empty tank is between 6 and 8 PSI.

Pump in Air if Necessary

If the PSI (pressure) is less than 6, use a bicycle pump or an air compressor to pump air into the valve until the PSI reaches 6-7. Be careful not to overpressurize. You will see some water coming out of the tank. This is acceptable. Continue adding air pressure until the water stops, then check the PSI.

Check or Correct PSI and Repeat if Necessary

Close the valves and faucets after the PSI is normalized. This will allow the water from the membrane to flow back into your sump. The reverse osmosis filter tank will now work back as it always did.


  • Bucket


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


  • Plumber Putty


To pressurize a reverse osmosis system or tank, you need to follow some easy steps. Be very careful when doing this so that you don’t damage anything. It is also important to maintain the correct pressure within the tank so that the reverse osmosis system works well for a long time.

If the pressure inside the reverse osmosis tank is not correct, it can cause problems with the water. This can include low water pressure, no water, and water that is not filtered correctly. Taking care of the tank is just as important as taking care of any other equipment, and affects how long the system lasts.

Read more: Unfiltered Fervor: The Rush to Get Off the Water Grid

Frequently Asked Questions About Reverse Osmosis Tank Pressure

What Happens if RO Tank Pressure Is Too High?

If the pressure in the tank is too low, the water stored in the tank will not flow out of the faucets. If the pressure in the tank is too high, water flowing from the filters will not enter the tank.

How Much Air Pressure Should Be in Water Pressure Tank?

Check the air pressure in your tank by using a pressure gauge. The air pressure should be 2 psi below the start pressure setting of your pump.

How Do I Know if My RO Tank Is Bad?

Checking the water pressure is a way to see if your tank needs to be replaced. If water spurts out when you check, the tank’s diaphragm has lost integrity. If the tank is full and the pressure is more than 20-25 psi, but there’s no water coming out of the faucet, make sure the tank is still working.

Why Is My RO System Hissing?

You may hear air being pulled through the air gap with reverse osmosis (R/O*) systems. This noise is caused by the air gap, which prevents the system from back-drawing and dispensing “”dirty”” (unfiltered) water from the system drain.

Why Does My Reverse Osmosis System Constantly Drain?

If the tank pressure is low or the shut-off valve or check valve is broken, water might flow continuously down the drain. This means your RO system wastes a lot of water and makes a lot of noise.