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 indicates the percentage of lead that was removed by each filter.
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 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
Filter cost Filter cost per year is based on claimed cartridge life span. For certain reverse osmosis units, professional service (PS) is recommended by the manufacturer. The filter cost/yr. for the reverse osmosis units does not include the osmotic membrane which typically lasts at least two years
Filter-life indicator Filter-life indicator shows models with this feature.
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:
No, I would not recommend this to a friend.
By The Tampa, FL water filter guru
from Tampa Bay, FL
Fantastic Filter !
Doesn't Take Up Much Coun
Ease Of Connecting
Uses little space
Changing Filters Tricky
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
Yes, I would recommend this to a friend.
from Boston, MA
H2O OK--Maintenance=High Coronary Risk
I have had several rage episodes trying to replace parts, spontaneous leaks, etc. Don't purchase this! Fine until you have to replace filter (every 6 months). Clean water is not worth this aggravation. Really aggravating! Avoid avoid avoid! From one very regretful customer. Buy bottled water! Save yourself from having a coronary!