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Some producers use membrane separation (called "reverse osmosis" or simply "RO" within the maple industry) in addition to evaporation with heat. In this process, sap is forced through membranes that have pores which are large enough for water to p...
Maple sap, what's in it? Maple sap is a dilute solution of mainly water (95-99%) and sugar (1-5%), along with trace amounts of other substances, including: organic acids, free amino acids, protein, minerals, and phenolic compounds. Sap coming dire...