Had a two stage system at our last house. When we moved we upgraded to the 3 stage. Glad we did. I love the fact that it beeps when it needs to have the filters replaced.
Pros: Clean taste, Durable, Easy to clean, Easy to install, Long lasting filter
This water filter should take all others off the market. Its that good. Everyone that comes over always compliments my great tasting water . We have a 4 family household . I'd recommend reordering filters every 4 months rather than 6 if you have a family size like mine. Also it is helpful to remember where you end on the twist when pulling out old filters, or even marking them, for replacement. Or else you could be down there for a half hour + trying to find an acceptable entry point. Hopeful for a marker upgrade aquasana. :)