If there is a
separation between black and grey water check to see if the 34(36) has three
holding tanks, one for potable water, another for water from the kitchen and
lavatory sinks, and a third for holding crap and stuff.

This Black/Grey/Water designation is something I see in specs for mega yachts
generally. Like my C&C 32, the 36 has two fresh water tanks.

RB