Go for the highest HP u can get locally such as 1.5 hp to minimise the chiller run time and to reduce electrocity bill. it's more econmony in the long term
Re u using overflow ? If yes, the current is not pushing that pool of oil down back into the overflow. Or alternatively, try to use a PH to blow near to the water surface to create ripple current
Going thru the forum discovered that most of the pioneer members had gone M.I.A. I mean those register during year 2002. What happened ?
p/s:maybe AT could award those 02 members some loylity points