RE: Holding tank and water tank=which side for pump out and fill???
They are supposed to be separate tanks. At least mine appear to be, as I can feel the seam under the glass. I'd verify that your waste tank vent line is not plugged; then close the seacock that supplies seawater to the head, and see what you get when you pumpout. Check the vent line for a filter that may be plugged , or wet, as well as checking the fitting on the hull exterior, the line itself, and the fitting that the line exits the waste tank from. Mine was plugged inside that fitting, leading to a really nasty situation inside the head compartment as things started flowing the wrong way. Be careful and make sure that vent line is open before you apply any suction with the seacock closed. Good luck.
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