After running it a week now I see I'm going to make some changes in it. Follow me here a moment. The package comes as a drop in to use the selector valve for both tanks and that 044 Bosch is a near monster which I believe is a problem. The noise I'm hearing ( I believe ) is some cavatation. The way the pump is mounted vertically, and pre and post filters on either side there are four 90 deg fittings and one on the selector valve and probably one on the tank.that to me is a lot of restrictions. I'm thinking getting a longer metal frame mount and laying the pump horizontal and eliminateing all four 90's thus reducing the restrictions.