thats exactly what we should have done, dont know the column yet still researching it. How many plates would you recommend starting with? Also as we come from a thumper world how long to rectify? At a certain point it can only rectify so much and the vapors will pass to the column, right? So lets say i only wanted to use 3 or 2 plates , since it feeds from the bottom up the column i guess we would have to by pass the upper two or three plates?