Here is an overview of my homemade Reverse Osmosis system for concentrating maple sap. I can reduce the total volume of sap by 2/3 and take off about 40 gallons of water per hour. Sap this year has been averaging 2.5% sugar. After RO it goes into the feed tank for the evaporator at 7.5%-8%. Saves a lot of boiling time and a lot of wood.
