Darrell, Agree with that. But I have no clue on the correct ratio. I was really more interested in the ratio that Steve Smith was using and his thinking on that. Thanks. Bob S. ____________ I think you will find the "2-1 volume as per Krause" is not >necessary and is a waste of energy in the pump cycle because you have to >dump the extra air through releif valves. > >Darrell