How to Change Aquasana AQ-4000 Countertop Filter Cartridges

In this article, you’ll see how easy and quick it is to replace the cartridges in your Aquasana AQ-4000.

Cartridges last between 6-9 months with normal household usage. Click here to see the cartridge replacement pack.

In this video, learn how to effortlessly change the cartridges in your Aquasana AQ-4000 Countertop Filter! Follow the step-by-step guide to keep your water clean and refreshing, all while keeping the mess to a minimum. Say goodbye to old filters and hello to pure water!

How to Change Aquasana AQ-4000 Benchtop Filter Cartridges

1. Place the unit in the sink when changing filters to catch any spills. Remove the threaded filter caps by turning in the direction of the arrows. To loosen, turn A cap to the right and B cap to the left. 
2. Remove old filter cartridges and dispose of them in the trash. Reuse existing large O-rings as they have a 10-year lifecycle.
3. Install the new filter cartridges. Insert the “A” cartridge with the nipple-end first. Then, press and rotate to seat properly. Install the “B” cartridge by inserting the nipple into the “B” cap.
4. Tighten the threaded filter caps firmly in the opposite direction of the arrows shown on the caps. The “A” cap will tighten by turning it to the left. The “B” cap will tighten by turning it to the right. Ensure O-ring is in place.
5. Turn on the cold water and check for leaks with the filter still lying flat. If leaks are noticed, repeat step 3 and 4. If no leaks are noticed, return the filter to the upright position and allow the water to run for 10 minutes until all cloudiness and discolouration have disappeared.
6. Enjoy the benefits of drinking clean, healthy water!

If you have any questions regarding the cartridge replacement for the Aquasana AQ-4000 please feel free to contact us.

Cartridge Removal Tip:

Note: The cartridge replacement process for the Aquasana AQ4000 is the same for other Aquasana models, including AQ4035, AQ4000B, AQ4000P, AQ4500, AQ4501, AQ4600 and AQ4601.