I've recently fitted on of the eductors I originally made for you in 2007 using the ubiquitous HF/Clearwater pumps.
I got a full conversion/good 3/27 pass in 50mins using a 6mm jet through a 13.5mm venturi shaped body.
I won't be going back to the standard method.
BTW I'm still using a venturi to dose the methoxide and de-meth.