Sewer Smell from Bath Tub
We recently installed a bathroom in the basement of our house. There is a sewer smell coming from the bath tub drain. I did not do the installation, nor was I home when it was completed. What I can tell you is, when I pour some water down the drain the smell does go away for a while, but it always comes back. Any help would be greatly appreciated.
Was the job 'inspected'.........Drains need vents that take the sewer gasses thru the roof ...........water-filled traps are located beneath each fixture to stop gas from entering the building.............IF NO VENT WAS INSTALLED....or improperly installed ......water rushing thru the drain pipes can pull the water out of the tub-trap and let the gas enter..............Check back with your installation "Plumber"........
IF there is a trap i've heard you can dump a small amount of vegetable oil down the drain to keep the water from evaporating from the trap. This was recommended for drains that don't get used. Now obviously you don't want to do this after your bath every day or your septic field, if you have one, will need to be fixed.