Smell in a toilet that's go me confused.

[sulky]

have you checked the septic tank to make sure the inlet level is below the pipe going in (outlet blocked ) also is there a vent at tank, plus there should be a vent at top of pipe run as near the toilet as possible or a auto/vent ,as I have had gases build up in pipe run during times of none use and air /smells blowing back through s bends as bubbles .and the gas can smell slightly different to sewerage

 

[Lincsman]

We had a similar issue in the ensuite, it was the ubend trap in the sink and/or shower getting sucked dry by other toliet use, i bought a Ubend thing that allows air into the system from wickes and it cured it.


http://www.wickes.co.uk/Wickes-32mm-Anti-Vac-Bottle-Trap/p/118612

 

[Ukjay]

No windows.

If this were my property, and it had no window in the toilet with an acrid smell - I would be looking at damp being a possibility, as you mention it is worse first thing in the morning.
Obviously the room is shut up over night, and the smell is intensifying through no air exchanges, and possibly why they say that the smell comes and goes through the day.

An old carpet can smell vile (people peeing on it when they miss the pan, dirty feet etc etc, but would not necessarily feel wet to touch, and I personally feel you can never clean carpets thoroughly enough to remove this contamination.

The U bend on the basin and the toilet pan should not allow gasses to vent back into the room overnight, as the toilet and basin are used you say, so by your sealing the toilet outlet where it goes into the concrete leaves physical items in the actual room as you also state definitely no dead animals.

As an aside - rather than use silicone, I would have removed the toilet and fit one of the finned repair couplings that you push down into the old clay pipe to give the recommended seal.

Assumptions here:
# that the vent pipes installed on the Klarg set up are freely venting - allowing the gasses from the pipework and tank to escape, and subsequently removing any possibility for gasses to be forced back up through the pan, through blockages.
# that the basin pipework is not fitted in a manner that can allow self syphoning of the water in the trap after use (you can get a suction created if the plumbing is fitted in a manner that allows the bore of the waste pipe to full during emptying into the open drain.

 

[davidroberts30]

Perhaps the vent pipe is blocked (or Dirgo?) and the smell is bubbling back.

sounds like it ,flush the toilet and the waste draws the water out of the sink trap

 

[Philip Watkins]

.........
# that the basin pipework is not fitted in a manner that can allow self syphoning of the water in the trap after use (you can get a suction created if the plumbing is fitted in a manner that allows the bore of the waste pipe to full during emptying into the open drain.

The OP states

......

All there is in the room is a basin with a u bend underneath, then the waste is piped into a drain outside, but the waste stops over the drain and there's an air gap so no real way a smell can come back that way.

.......

 

[Ukjay]

The OP states

Hi

Unfortunately within the OP, it did not state how the pipework leaves the building from the basin. For example, how many bends, what fall is on the pipe, how long is the pipe, is it clipped at the appropriate spacing, does it exit the building directly out from the back of the basin trap, then travel down at a steep angled pipe to the outside drain and so on.

If a pipe has a very limited fall, or no fall at all, or the clip spacing is not correct on the run - then you can actually create an environment that your basin water can sit in the pipe / undulations and go rancid - which if it is also on a poorly piped system that allows the trap to self syphon - you can get foul smells leading back into the home inside due to cold air outside and a warm room inside giving slightly negative air pressure drawing the smell in, plus the drain smell itself.

Additionally, it does not state if the U Bend has been off and inspected only that the U bend had been cleaned (which could mean through chemical cleaning via the plug), whereby Hair trapped over the U bend can draw water over and basically empty the bend allowing the smells to come up the pipe.

All the information to go on was that the terminal point is above the ground drain - leaving an air gap, and a U Bend.


Sometimes in occasions like this, adding a HepVo valve is a better option than using the std basin traps, as they are self sealing and do not rely on a water bridge to prevent smells coming back up the pipe:

http://www.wavin.co.uk/web/download?uuid=1e525998-c0a3-4769-8901-e0f2ef26e011

Unfortunately things are difficult to diagnose on via forums, but we sometimes have to assume the OP has done a lot of the basics (which I have assumed in this scenario due to thing he has already tried), but as you can see - there are a load more questions that this particular problem can raise.

Kind regards

Jay

 

[milkloss]

The OP states

Oh, do sit back down!

 

[Philip Watkins]

Oh, do sit back down!

Hmm, I have been told, haven't I.

 

[phillipe]

had one instance like this last week,drains wee blocked close to tank fluid was seeping away leaving solids very smelly

 

[MickMoor]

Mice choose to die over hot pipes for some reason. We had one only last week. No smell at night, but in the morning when the heating switches on............