Ted, are you saying you engine draw off is from the bottom, or just the fuel polishing circuit..? If the former, that's fine. Good filters will deal with any crud continually, so it will never build up in a way it could clog the filters, even in rough water. If the draw off is via pick-up tubes, then having a polishing system drawing from the bottom is better than not having it, but it makes you wonder why it was done that way, as an engine draw-off from the bottom, going through decent filters tends to make a special polishing circulation a bit superfluous in my view.