My husband just installed this and, aside from a few issues with a minor plumbing leak, it didn't take long.  I did have to run the water longer than 5 minutes for it to be clear.  However, now my water no longer tastes or smells like bleach!! Hooray!  I've been using a Brita water pitcher, but I can't keep up with the amount of water used. This will make my life so much simpler.