Its surprising to me that many boats I see on Sydney harbour have the old school heads with no holding tank. I wonder where all the stuff goes? The few times we have ladies on board they never want to use the loo anyway, and I guess the boys go in the cup and then overboard. (many drowned males are found drowned with flies down)

I had the backing plates of my head thru hulls rotting out so I decided to get drastic. I ripped out the head, glassed in the thru hulls, and put in the porta potty. It was a ****ty job, but now I only have to lug the thing ashore once every blue moon. I guess I can feel smug not I have done the deed but I still wonder where all the other stuff goes?

It goes into the oggin. We are a fresh water animal as is our bacteria. It doesn't last long in salt water.

I've got one of those old heads in my Tophat from when I bought her. I have toyed with the idea of removing the existing heads and replacing with a portapoti.

My thought at the moment is that there is a small compartment under the forward berth that will fit a portapoti and I'm figuring I'll put one there and eventually retrofit a holding tank and macerator for the existing unit.