rludtke, yeah I didn't use clear English, we're arguing the same point.
The point I was trying to make, is that one of the general pros about using reversible pumps is that you won't need to use as much hose to finish your product. But what I said I don't understand is where people run their vent lines to when they have a reversible pump system?
With my aerator system, my vent lines T into my drain lines which then run outside the boat near the rubrail. There is a checkvalve between that T and the bag on the drain line to prevent back flow. What I'm trying to say, is if with a reversible pump system you still have to end up drilling holes in the side of the boat for your vent lines, I would just rather go with aerator pumps to take advantage of their cheap prices and faster fill/drain times.
Did that make sense? Sorry I may be a little woozy from a day and a half of morphine.....