 This is a reverse osmosis and what this does, it will take water out of the sap. So I bring my sap into the shop in the afternoon and hook up and let this run overnight and it will reduce by 50, 60%. So in other words, it takes out at least half the water. Most of the time I come in at 2% which is 43 gallons of sap to make a gallon of syrup and I bring it down to around 5% which is 17 and a quarter gallons. So this takes a lot of the boiling time out of the equation. This is worth every penny you spend on it to reduce the amount of fire which you're gonna throw into that evaporator.