Posted 2012-06-21 8:14 PM (#145038) Subject: venting a gray water tank
Regular
Posts: 55
Do I need to vent my gray water tank with a stack vent or is that what the little hole is for on the exterior water inlet doors? Gard brought up a while back about something that replaced a p-trap under the sink. Does that replace a stack vent and will one also take care of the shower or does the shower have to have it's own? They would both brain into the same gray water tank.
Posted 2012-06-21 9:16 PM (#145040 - in reply to #145038) Subject: RE: venting a gray water tank
Extreme Veteran
Posts: 379 Location: Missouri
Yes you need to stack vent the gray tank. The air in the tank has to have some place to go as water comes in. The little hole next to your water inlet door, that's the vent for the fresh water tank. It's to let air out when you fill the tank and allow air in as the pump draws the water level down. The under sink vent is a one way vent to prevent water suction from emptying the p-trap, it does not allow air to escape the holding tank.
venting a gray water tank
