Does it matter at all where in the loop the water pump (Davies Craig EWP)  is located?   Also,  I wanted to run 1.5 hose throughout the system but it is nearly impossible to build an adaptor block that will accommodate 1.5 lines. due to space limitations.   More likely the passages in the block would be less than 1.25 but could be expanded outside the block to 1.25.   Todd,  how big are the passages through your  adaptor block?   I am open to suggestions but it looks as if 1.25 i.d. hose is the max if one is using an adaptor block with DC EWP.   Maziere makes an adaptor block for direct mounting of their pump that has only .75 passages.  It would be nice to buy their complete system but Bob's text results seem to favor DC.      Jerry