I can hear water running when someone's in the shower, ... Never smelt sewage out there though.
Waste water from bath, shower, basins etc ('greywater') is often fairly 'open' and dealt with separately to waste from toilets
Shower, basin and bath wastes all join the soil pipe at the back of my house before entering the ground. Surely there not going to stay seperated within that?
No once they join they join, mine don't until they're both in the ground
You can probably hear the waste going through the inspection chamber thingy
@Polygon started
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Waste water from bath, shower, basins etc ('greywater') is often fairly 'open' and dealt with separately to waste from toilets