Brad, sounds like you have the reasoning backwards. Regardless of whether the HT is full, empty or anywhere in between, once you get outside the limit, you do not have to put any more into the HT to flush. That's the only difference.so I have to have a holding tank or not use a head while on the boat, and that can make for a distressful afternoon.
I don't have exact numbers to back up what I'm about to say, but let me mention the following. Here on Long Island sound we are bordered on the north by New York and Connecticut, the south by Long Island, and the West by NYC. When it rains heavy, millions upon millions of gallons of rain water runs off over the land and into the water carrying who knows what number of particle pollutants from our streets and bacterial nutrients like nitrogen off our lawns and farms. In addition, it is a fact that in heavy rains, almost all of the NYC sanitary sewer (the one filled w/ sh-t) systems get over flooded and run into the storm sewers spilling MILLIONS AND MILLIONS OF GALLONS OF SEWAGE into the waters. Although NYC Dept. of Environmental Protection has begun to update all of its sewage plants to prevent this, it is far from being completed.just shows you don't need brains to be an admiral. should we eliminate the whales so recreational sailors have water to dump their waste? are there more whales or weekend sailors? please, it's no big deal to obey the law, even if some admiral thinks not. there was a time when people, like whales, were rare, but those days are gone and we must adapt. or move inland. or drink and sail in waste.