Followed the directions, cleaned it, filled with 4L of water and turned it on. Filled the supplied jug in about 3 hours. Only problem I had was the silicon gasket is tight. Needs 2 hands to remove top. May loosen up with time although not a problem.
In the winter we go through a liter of water a day with our humidifier. This is so convenient and simple. It's a little loud, but we stick it in the laundry room and run it overnight.
Great unit. does as exactly as specified. Makes a gallon of distilled water in about 2 hours. saves a trip to store if they have iit. Getting harder to find.