pump 2 configured so as to be capable of sustaining a pressure of about 250 psi this insures that it is no longer necessary to use a conventional feed pump as is done in the prior art the feed pressure pump 2 actually performs the function normally done with two pumps feed pump and pressure pumps in prior art systems hence the higher pressure at this stage in order to keep costs low for the small entrepreneur the maple sap reverse osmosis device 20 uses the most economical components for example the feed pressure pump 2 is a low cost 120 volts highly efficient rotary vane pump the pump has the advantage of not warming up the sap since a warm sap could cause the proliferation of bacteria and thus be harmful to the resulting maple syrup 39 s quality the prior art uses a 4 in membrane capable of a capacity of 150 gph at 500 psi in a preferred embodiment the osmosis membrane 3 is used at a rate of 100 gph at 250 psi this lower pressure allows for the use of the low cost feed pressure pump 2 described hereinabove and which is typically able of a maximum capacity of 250 psi the advantage of using a lower 250 psi over the more conventional 500 psi is that the osmosis membrane 3 has a lesser tendency to foul at the lower pressure the other advantage the use of low pressure membrane housing reduces the cost of this one significantly up to 4 times the.