The process of producing maple syrup from maple sap can include concentrating the maple sap to a sugar content of between 30 and 50° Brix using membrane filtration, including increasing a differential pressure of the membrane filtration in accordance with an increasing of an osmotic pressure as the sugar content increases to eventually reach the sugar content of between 30 and 50° Brix; and subjecting the concentrated maple sap having a sugar content of between 30 and 50° Brix to evaporation until it transforms into maple syrup.