Last year I replaced the holding tank. I kept the original vent through deck fitting, but installed a 3/4 inch hose from the tank to a 3/8 inch hose and then coupled that to a woefully small through hull. A larger diameter vent hose helps promote oxygen flow in the holding tank encouraging aerobic bacteria to flourish. Aerobic bacteria break down the waste, but don’t put off a foul odor. There’s plenty more information about holding tanks at The West Advisor and from Peggie Hall’s book How to Remove Boat Odors.
What I did today was remove the old through hull fitting and replace it with a 3/4 inch fitting to match the hose size and encourage as much air as possible to get to the tank.
The last part was connecting the vent line hose with a hose clamp.
Hopefully this new vent through hull will make the holding tank less stinky. We’ll have to flush and see.
Thursday, February 21, 2013
Over on s/v Astraea, Nate tackles the problem of getting adequate holding tank ventilation.