Rotten sulphur/egg smell from bath plughole

chewed

Over the past couple of months, I'm constantly getting a horrible Sulphur smell from the bathtub in upstairs bathroom. This used to happen maybe every 6 months and I used to plunge it and the smell would disappear. Now it's happening all the time but comes and goes throughout the day.

I've tried everything - baking soda/vinegar, boiling water, bleach, plunging, but the smell keeps coming back. I've even checked all the outside drains but they're all clear.

Before I call out a plumber, is there anything I could do to try to fix the issue? Could this a be big issue to fix?

youtheman

The obvious 'culprit' is that you are losing the water seal in the u-bend in you sing/bath/shower. If the seal leaks or dries out then the foul smell from your sewage system has a free run back up through the pipework. So look for a leak in the drain pipework. Or try just see that the u-bend is 'wet' at all times.

Lenar3556

Certainly the trap needs to be checked, but it sounds like there may be something more than a trap that has simply dried out.

Sometimes a situation can arise where a siphon type event occurs in the system and routinely pulls the water out of traps. The solution is usually to introduce either a vent pipe or air admittance valve.

chewed

Thanks for the comments. Are any of these suggestions a big job to do?