I am looking for reccomendations and or experiences anyone might have had in installing a "grey water" holding system. At this point I am debating the use of a flexible tank (location???) versus giving up my bow fresh water tank and converting it to grey water. The shower which presently drains to the bilge is another issue. I will be using the boat on a fresh water lake that allows no grey water discharge so it must be held and pumped out.