Three Plumbing fixtures in your toilet are suspect when it comes to bad smell (which is caused by sewer gas finding its way back into your toilet). The first is the WC, the second is the drain and the third is the Basin.

WC: when the water seal of your WC is broken, it gives room for sewer gas to come into your toilet. There are many reasons that can cause the seal to be broken (that's another topic)

Drain: if the drains (bath, basin and floor drain) are clogged then you can experience smelling toilet.

Basin: in Nigeria, most of our basins use magic waste instead of traps. Magic waste is not designed to hold water so when sewer gas travels backwards into the waste pipe, it's easy for it to come out of the basin via the magic waste.

Another cause can be if the waste pipe was not laid properly. The right gradient was not observed, then, the pipe may retain waste that may later decompose and send back bad odour into the building/toilet.

Every waste pipe must be properly vented (and I mean every waste pipe, both water and sol waste pipe), but the truth is in Nigeria, this is not always the case all the time. Every waste passing through the pipe emits gas which you must create a channel for it to escape else it looks for its own escape path and which mostly in the toilet.

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