Wait, aren't you the one who was complaining in another thread about charter boat head discharge into the waters causing coral death? Many, if not most, sleep aboard charterers arrive as the staff is leaving or later, so no time to go over holding tank valve closing/opening, and most charter companies do not close their boats' holding tank valves. So you're ok with charterers using their boat's heads and discharging into the waters at their base? In fact, charter base restroom quality is an issue for many people who don't want to use the boat's heads at the base, for that very reason.