i am about 6-7 min from empty to almost 3000lbs in the boat. I would rather that than be 3-4 min and have to deal with the aerotor pumps and mounting below the water line and the anti syphon valves. Also when I am filling I am sometimes in pretty weedy water, not prob for the reversible pumps. also you do not need to have drain pumps as well. it is more simple. I really have a box of parts sitting in my garage with 6 pumps, sprinker valves, strainer, hose, wire, sprinkler tree.