I mounted mine in my laundry room. That way it was out of the way, I can run the waste into the washing machine drain, and can take the waste line out to fill up my water pitcher. It is also easy to get to when I need to change any of the filters. Another advantage of mounting it in the laundry room, is I used a Y adapter, with valves on both outputs, from the cold water lead to the washing machine. One to the washing machine, always on. And one to the RO/DI which I turn on and off as needed. Total cost at Home Depot for the Y adapter with 2 on/off valves = $1.49