Question

why drain water smell foul​

Answer 1

Answer:

The smell of drain water is likely to be caused by bacteria in your drain

The gas Hydrogen sulfide is most likely to cause this smell...

Hope it helps..

Answer 2

Answer:

the smell of sewage is likely caused by bacteria in your drain producing gases that arise when the faucet is turned on hydrogen sulphide is the gas most likely to cause this smell so the drain water smell foul