Russ: I use this pump setup from home depot. Basically plumb in at exhaust hose, then from back of Impeller housing, then back to a large storage tote. The pump is put into the tote along with 5 gallons of BB. I like to circulate it backwards from normal seawater flow so anything lodged goes upward and back to bottom of tote. Had to buy some large hose barbs\ couplers\ clamps. Barn bust is some nasty stuff, wear good eye protection.
The tote makes a nice place to store everything for next use too.