Hi Joe,Hi Jim, My reactor is pump mixed too,but I am using two pumps of different types-one SS from the food brand and the other is clear water-cast iron case and turbine.As far I am controlling carefully the both and I didn't`t noticed any changes,the pumps are in fine condition.BTW,the pumps are capable of recirculating the volume of the R 20-22 times in an hour and the BD is prima!I tried for comparison injecting the MeOH in the inlet and to pore slowly on the top and did not noticed any diff in the BD-it is always OK.It seems that the temp and agitation are what counts. Best Rumen
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