Editorial Product Review:

Item Description:
Aquasana undercounter water system AQ4000 includes everything you need to install a Consumer Digest 'BEST BUY'-rated Aquasana AQ-4000 water filter under counter. The combo includes filter and an attractive, convenient, lead-free faucet and all the necessary fittings, tubing, brackets, etc. Offer includes Aquasana AQ-4000 filter, a faucet, and all necessary fittings and brackets to install filter under counter. The Aquasana 4000 Undercounter far exceeds all the stringent NSF testing for standards 42 & 53; State of California Health Department Certified Aquasana 4000 Undercounter #99-1407 as well as IA, WI, CO, etc. For municipally treated water only. This undersink filter removes 99% of chlorine, 99% VOCs, 99% lead, 99% THMs, 99% Benzene, 93% MTBE and many other water contaminants. The filter provides filtration to 0.5 microns while leaving in all the healthy, natural trace minerals for great taste.

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More related to this product:
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More related to this product:

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Customer Rating: - Not impressed after 2 years of use
I did some research before chosing this unit - although it is hard to find reputable and unbiased info on the web the Aquasana system seemed to have a good reputation. I would agree with other reviewers that the system seems flimsy; although I haven't had any parts break, I had trouble getting replacement cartridges to fit without leaking. I also have had problems with the dispenser dribbling and running on for a while after use.

My biggest issue is perhaps not the fault of the unit, but the water tastes weird if it sits around in a glass for a couple of hours after being dispensed. Not sure if this is due to my water supply or to the water filter.

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Customer Rating: - Future cabinet damage ahead
We had both the shower and under counter filter for about three years. First the shower filter case cracked. About six months later the under counter filter case cracked causing some damage to the cabinet, floor trim, and wood floor. Fortunately we were home at the time and not out of town. It's almost certain to say from other reviews that other aquasana AQ4000 filters will do the same. They should really do something about this.

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Customer Rating: - The worst purcahse ever...
Why I decided to buy this product before I checked the reviews on Amazon is beyond me. If I had, I would never have bought such a poorly designed product.
It is impossible to change the filters in this product as the threaded caps for each filter unit stick so tightly that it's impossible to remove then using the tabs provided. Unless you add vegatable oil (which defeats the purpose of filtering your water) to lubricate the caps you would need a wrench to remove the caps. Using a wrench to unseat the caps will ultimately wreak the cap and you will be forced to buy a new one. Auqasana will happily sell you new caps.
The unit leaked the first time I installed it. I ordered new caps thinking that perhaps there was a problem with the way I had installed the unit, but no. Even after a new cap was installed, this unit continued to leak from the coupling between the filtered water tube and the cap. Good thing they added a high ridge around the top of unit which collects this water so you can sope it up with a sponge later making you regret your purchase even more!
It is ugly. The undercounter solution really is an inverted countertop unit hanging on a metal frame that appears as if it was really designed for something else and retrofitted to hold the "filter unit".
Lame, really lame.
I bought a GE model instead.

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Customer Rating: - Too many problems
Filters are much more difficult to install than I think they should be, unit consistently breaks or has a problem every few months. The white plastic filter housing has broken twice (see photo) and I've had to replace the faucet/dispenser at least once because it constantly dripped or even poured. I am now on hold to get another part since I am a "Water 4 Life" subscriber for about $100 year - which includes two filter changes and warranty. Eventually I will probably spend the time and money to get a better unit.