Can't help with freshwater.It is a fresh water head and seams to use about a gallon of water per flush it seems like that's a lot to me.
Yes, I just don't know how much water is needed.if freshwater you can put a 1/4 turn ball valve in the fresh water inlet side and adjust the water flow accordingly...........Pat
I get it just seems like a gallon is a lot. The water pressure on the boat is very good so I would like to turn the flow down some, but I do not want problems with the brown trout.Water is what the crap rides on to the pump wont ride on air to the pump unless you have a Vac U Flush.Bob