Added a simple preheater made from 24' of 3/4" copper seems to work nicely. Built an RO with a 2400 GPD 4x40 membrane. Currently at 200 psi it is running 1 gallon of water per minute and 2.5 gallons per minute of concentrated sap. Last reading was raw sap 1.9 Brix concentrate 4Brix on a single pass. Try to post some pictures tomorrow.