We have had our Eco-335 system for about 5 years. What you are not told is how expensive the filters are to replace. We are retired and it is a burden to buy all of these expensive filters. For 3 filters it runs from $208-$231 each time you have to replace them. The company is difficult to reach unless you deal directly with the office you bought your system from and then it takes lots of time to reach them. My best advice it to not buy this system unless you have money for the filters. The first time they were replaced it was $178. Now it's up considerably. read full review »