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How to Change Aquasana Water Filter? – Super Easy to Follow Steps

Fact checked by Stephen Conklin

how to change aquasana water filter

It’s common sense to change your Aquasana water filter regularly. But how to change Aquasana water filter is a frequently asked question.

It can be done easily and quickly. The steps just depend on what kind of filtration system you’re using. And they are provided in this article.

Read this guide, and you will find the answers you need. If you have other questions, Aquasana customer service can help you. They are available from Monday to Friday.

Table of Contents

What You Need


Aside from new filters and (maybe) a towel to catch drips, you should have the following:

For Whole House Systems: A bucket, A wrench, Silicone grease.

For Under-Sink Systems: Alarm battery (for 2-stage and 3-stage filters).

For other systems, like the countertop and shower filters, you won’t need special equipment.

Step-By-Step Instructions


There are different procedures on how to change Aquasana filter for the different types of Aquasana filters. They are all very easy to do. You can find Aquasana filter replacement instructions below:

Aquasana Whole House Filtration Systems

Step 1: Place a bucket below the pre-filter to catch the remaining water.

Step 2: Shut off the water by turning the valves beside the pre and post-filters downward. And open the bypass loop located at the upper pipe by turning it upward.

Step 3: Press the filter housing’s pressure release button at the top of the cap to release it of pressure.

Step 4: Unscrew the housing clockwise with a filter wrench.

Step 5: Let the remaining water drain.

Step 6: Remove the old filter.

Step 7: Pour out the water from inside the housing into the bucket.

Step 8: Wash the housing.

Step 9: Take out the O-ring. Wipe out the old silicone grease from the O-ring and housing.

Step 10: Put a new light coat of grease around the O-ring.

Step 11: Put the O-ring back, laying it flat into the groove.

Step 12: Unwrap the new filter and place it centered in the housing.

Step 13: Screw the housing back with your hands.

Step 14: Repeat the steps for the post filter.

Read more: Tips to change whole house water filter.

Aquasana Under Sink Filtration Systems

2-Stage, 3-Stage, and 3-Stage Max Flow Under Sink Filtration Systems

Step 1: Leave the water supply on.

Step 2: Remove all the sumps by rotating them clockwise and pulling them down.

Step 3: Unscrew the cap from the sump.

Step 4: Dump the remaining water from the sump.

Step 5: Pull out the old filter from the cap.

Step 6: Place the new filter.

Step 7: Screw the cap back on the sump tight enough to close it.

Step 8: Do the same to the other sump(s).

Step 9: Return the sumps per the color-coding on the wall mount.

Step 10: Remove the old alarm battery and place the new one with the positive side facing the back. The alarm will beep 5 times.

Step 11: Check the system for leaks.

Step 12: Flush the system for 10 minutes.

OptimH2O CTO and Claryum Filters

Step 1: Turn your water supply off, ensuring the valve is tightly shut.

Step 2: Turn your filter faucet on for about 5 to 10 minutes to drain the remaining water in the filters.

Step 3: Rotate the sumps 90 degrees clockwise and pull them down.

Step 4: Unscrew the cap from the sump.

Step 5: Take out the old filter.

Step 6: Dump the remaining water from the sump.

Step 7: Insert the new filter.

Step 8: Screw the cap back on.

Step 9: Do the same for the other sump.

Step 10: Return the sumps to the wall mount.

Step 11: Turn your water supply on.

Step 12: Fill the tank for two hours.

Step 13: Check the system for leaks.

Step 14: Flush the system until the pressure is gone.

Step 15: Refill the tank for two hours.

OptimH2O Reverse Osmosis Membrane Cartridge and Remineralizer Filter

RO Membrane:

Step 1: Turn your water supply off, ensuring the valve is tightly shut.

Step 2: Turn your filter faucet on for about 5 to 10 minutes to drain the remaining water in the filters. You may need a towel to absorb drips.

Step 3: Unplug the red tube from the white elbow.

Step 4: Keep the black flow restrictor attached to the tube.

Step 5: Rotate the membrane 90 degrees clockwise and pull it down.

Step 6: Remove the elbow attached to the membrane.

Step 7: Discard the used membrane.

Step 8: Insert the elbow into the new membrane.

Step 9: Put the new membrane into the wall mount.

Step 10: Connect the red tube into the elbow attached to the new membrane, ensuring the flow restrictor is kept in place.


Step 1: Pull out the white and red tubes from the remineralize.

Step 2: Take the remineralized out of the wall mount.

Step 3: Discard the used remineralize, and insert the new one.

Step 4: Insert the tubes into the remineralize by one full inch.

Step 5: Turn your water supply on.

Step 6: Inspect the system for leaks.

Step 7: If there is leakage from the red tube, check if the flow restrictor and tube are placed properly.

Step 8: Turn on your faucet and let the water run for 24 hours. You may collect the water for houseplants, gardening, pets, and washing.

Step 9: Wait two hours for pressure to build up in the reserve tank before using it.

Aquasana Drinking Filters

Step 1: Put a towel underneath the filtration system to absorb dripping water.

Step 2: Unscrew the white filter cap clockwise and the blue cap counterclockwise.

Step 3: Take the filter housing out of the wall mount.

Step 4: Take the blue filter out first. And with the blue filter’s fins, press hard and twist counter-clockwise to loosen the white filter. Then pull it out.

Step 5: Put the O-rings in the housing.

Step 6: Insert the new white filter in the housing with its red rings going in first. The new blue filter should be inserted with its red rings in last.

Step 7: Return the housing to the wall mount.

Step 8: Screw back the caps per filter color: white cap for the white filter, blue cap for blue filter.

Step 9: Check the system for leaks.

Step 10: Flush the water for 10 minutes.

Claryum Countertop Filter

Step 1: At the bottom of the housing, unscrew the left cap clockwise and the right cap counter-clockwise.

Step 2: Take out the filters.

Step 3: If the O-rings fell, put them back in the housing.

Step 4: Insert the new filters. Tighten the caps.

Step 5: Check the system for leaks.

Step 6: Flush the system for 10 minutes.

Shower Filter

Step 1: Unscrew the system from the shower pipe.

Step 2: Unscrew the showerhead from the system.

Step 3: Unscrew the top from the old filter.

Step 4: Remove the cap and the label from the new filter and screw the top onto it.

Step 5: Make sure that the white washer is kept in place, then screw the filter back in.

Step 6: Flush the system until the water has become clear, then do a surge flush.

Step 7: Screw the showerhead back in.

Step 8: Check the system for leaks.

When Should You Change your Aquasana Water Filter

When you should change the Aquasana filter varies among filtration system types and models. Aquasana has whole house, under the sink, countertop, and shower filtration systems.

Most of Aquasana’s filtration systems require filter replacement every six months, like the countertop filter, shower filter, and most of Aquasana’s under sink filters. However, the RO membrane and remineralize for the OptimH2O Reverse Osmosibest countertop water filtes + Claryum filter system are to be replaced yearly.

Aquasana’s whole house filtration systems include the pre-filter, main filter, and post-filter, so each part has different replacement schedules. Aquasana’s standard 10-inch pre-filter should be replaced every two months, while its 20-inch pre-filter for the OptimH20 model requires replacement every six months.

In regards to main filters, the 1,000,000-gallon RHINO main filter has the longest life span at 10 years, followed by the 600,000-gallon RHINO main filter at 6 years, and RHINO Well Water main filter at 5 years. The OptimH2O main filter, however, requires replacement every year.

Aquasana’s post-filters require replacement every 6 to 12 months. It also depends on your water’s sediment levels.

Moreover, add-ons you may have included in your whole house system, like the UV light and water conditioner, would also have their respective schedules for maintenance. For the UV light, it’s every 12 months. For the water conditioner, it’s every 6 years.

What Does the Red Light in your Aquasana Filtration System Mean

Some Aquasana filtration systems come with an alarm system, which includes a beep sound and a light indicator. When it’s time to change your filter, the Aquasana filter beeping would sound. And the Aquasana red light would appear on the light indicator.

By the time you change your filter, a change of alarm battery would also be required. It’s important also to change the alarm battery, as this helps in filter maintenance. An alarm battery comes with your purchased filter, so there’s no excuse for you not to change it.


Aquasana water filtration systems are favorably designed for the ease of filter replacement for Aquasana users. Anybody can easily replace Aquasana filters just by following the instructions.

There is also the added convenience of the alarm system in some models and the assistance of Aquasana’s customer service in case Aquasana users encounter troubles.

Hopefully, you now know how to change aquasana water filter. Thanks for reading!

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