Willem deVries wrote:
"when you saw waste spurting out the vent."

Which vent?


All tanks--water, fuel and waste--have to be vented...'cuz unless air
displaced by incoming contents has an escape route, backpressure
prevents 'em from being filled--or in the case of holding tanks,
flushing pressurizes the tank. Air also has to have a way into a tank
replace contents as they're drawn out...otherwise, the pump (fuel pump,
water pump, dock pumpout or macerator) pulls a vacuum that prevents
anything more from being pulled out. That means it's very important to
make sure all the vent lines don't get blocked.

CG regs require that all fuel and waste holding tanks be vented to the
outside of the hull...so they all have a hose coming off the tank at or
on the top that goes to a thru-hull fitting somewhere on the hull (above
the waterline of course). To find it, just trace the line from the tank
to the hull.

--
Peggie
----------
Peggie Hall
Specializing in marine sanitation since 1987
Author "Get Rid of Boat Odors - A Guide To Marine Sanitation Systems and
Other Sources of Aggravation and Odor"
http://69.20.93.241/store/customer/p...40&cat=&page=1