(not sure how these photos are going to line up on this post) Here is what our R.O. does. The photo on the left (the lower number) is before it goes through the R. O. The middle photo is the water taken out of the sap as it goes through the R. O. The photo on the right (the higher number) is one pass of the sap through the R. O. You’ll see the sugar content on the right reads twice as much as the sugar content reading on the left. Pretty cool huh? This saves us 3 hours of boiling and lots of wood.