Just did it
I had to open the vent screw on the top of the filter to break the vacumn on the bowl. It took a lot of torque to unscrew the bowl but the nut on the bottom of the bowl fits a standard wrench (but I can't remember the size, 1/2 to 5/8). If you want, & I recommend that you do, take the center aft panel out (aft of the berth) and you will have access to the tank. There is a shut-off valve on the tank-allows you to shut off the flow while changing filters.Be sure to reprime good.