Gray tank smells
I've posted about my problem before, and here is what I think is happening.
The gray water vent was installed low into the gray water tank, and did not project through the roof. I have corrected the issue as it projects through the roof plane and have installed a rotating venturi vent, which helps.
I have tried pulling the thru roof vent line upwards (as others have suggested), but it is restrained by a lateral shower drain, and cannot be raised.
When the tank fills (about 2/3 full), the bottom of the vent is submerged below the water level in the tank, and gases find another way to escape, and that is usually through the kitchen sink drains. If I close the drains, and fill the sinks with a bit of water, the smells do not occur. The "P" trap below the sinks does not seem adequate to prevent the smells. I have replaced the under-counter vent frequently.
I am considering putting a "T" in the vertical line to the under-counter vent and running a vent line downwards through the floor level to the exterior below the chassis. It's not a perfect solution. but running a vent line to the exterior is not possible through the roof or wall. It seems like the gasses should follow that route rather than upwards through the sink drains.
Dropping the tank to investigate seems like a formidable task.
Any thoughts?
The gray water vent was installed low into the gray water tank, and did not project through the roof. I have corrected the issue as it projects through the roof plane and have installed a rotating venturi vent, which helps.
I have tried pulling the thru roof vent line upwards (as others have suggested), but it is restrained by a lateral shower drain, and cannot be raised.
When the tank fills (about 2/3 full), the bottom of the vent is submerged below the water level in the tank, and gases find another way to escape, and that is usually through the kitchen sink drains. If I close the drains, and fill the sinks with a bit of water, the smells do not occur. The "P" trap below the sinks does not seem adequate to prevent the smells. I have replaced the under-counter vent frequently.
I am considering putting a "T" in the vertical line to the under-counter vent and running a vent line downwards through the floor level to the exterior below the chassis. It's not a perfect solution. but running a vent line to the exterior is not possible through the roof or wall. It seems like the gasses should follow that route rather than upwards through the sink drains.
Dropping the tank to investigate seems like a formidable task.
Any thoughts?
