Aquasana AQ-4000 water filter

Approximate retail price:
Price it button
Summary: This model has been tested by our experts.
Dividing line
Community icon37 people have reviewed this model.
Type: Countertop water filters
About - Aquasana AQ-4000

The Aquasana AQ-4000 is part of the water filter test program at Consumer Reports. In our lab tests, water filter models like the AQ-4000 are rated on multiple criteria, such as those listed below.

Lead removal:
Lead removal indicates the percentage of lead that was removed by each filter.

Chloroform removal:
Chloroform removal rates the percentage of chloroform removed. A filter's ability to remove chloroform predicts how well it will remove organic compounds as well as byproducts created by disinfectants used by water systems.

Flow rate:
Flow rate is how fast a gallon of water filtered through the cartridge. The criteria for flow rate scores differ between different types of filters. Faucet-mount, countertop, and undersink models have the same criterion; carafes and reverse osmosis models each have their own.
About This Brand

This company's countertop models use a dual-filtration system that includes an ion-exchange method in the water-filtration process. Its products are sold online and in plumbing-supply outlets.

Features & Specs - Aquasana AQ-4000
info Filter cost 108
info Filter-life indicator Yes
More features and specs
User Reviews - Aquasana AQ-4000
User Reviews
Already own it? Write a review
great, great product
Picture Took Out All Bad
Taste Filtered Very Fast
Best Uses
Carbon filter and filters 1/2 about a minute. Takes out so many bad chemicals including chlorine. Top Quality. Makes 320 gals per carbon filter - so economical.
How long have you owned it:
More than six months
Bottom Line
Yes, I would recommend this to a friend.
Very poor plastic component quality
Seems To Filter Well
Cheap Poor Quality Parts
Filters Overly Expensive
Best Uses
This is the second Aquasana under-sink filter system we had purchased - this one to replace the first one that cracked open and flooded our under-sink without warning. The second one looked to be an improved design, yet the same problem occurred - again flooding our under-sink after less than 5 month's use.<br /><br />Although we got about 2 years use out of the first one, the plastic screw-down cap that holds the filter in split at the threads and caused flooding under our sink and onto the hardwood floors before we realized there was a problem. We have normal water pressure - and it is additionally regulated with an a pressure regulator as it enters the house at 65 PSI static.<br /><br />In December, 2014 I replaced the product with a seemingly improved Aquasana 4601 system that after less than 5 months did much the same thing - this time the plastic threads separating from the cap - again causing flooding under our sink and onto the hardwoods.
How long have you owned it:
Three-to-six months
Bottom Line
No, I would not recommend this to a friend.
Fantastic Filter !
Doesn't Take Up Much Coun
Ease Of Connecting
Excellent filtering
Uses little space
Changing Filters Tricky
Best Uses
I have purchased 3 different variations of this product, both under counter & countertop. I have never had any of them leak. They have each given great service. I especially love the auto ship feature for getting new filters shipped every 6 months. You don't need to remember to order your filters, and you always have fresh water. No lugging gallons of water home!
How long have you owned it:
More than six months
Bottom Line
Yes, I would recommend this to a friend.
See all Models
Nobody Tests Like
We Do
Our testers put 100s of products through their paces at our National Testing and Research Center. Learn more about how we test for:
Learn more