RE: Holding tank and water tank=which side for pump out and fill???
typically there are several ways of emptying the holding tank.
Overboard by the use of a macerator pump and secondly by a manual pump.
Be sure to have this valve (below waterline) shut unless you are ready to legally pump it overboard (in california must be 3 miles from shore).
Thru a pumpout service line accessible on the port mid ship deck.
Most marine toilets pull in seawater to flush, if you wanted to verify this all you have to do is close the sea-cock typically located just forward of the head, below the forward bunks/closets on the sb side.
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