If your septic tank has gone a bit "wrong", and you can't put up with the smell of your own poo ;) then this is a very cheap and quick fix.
The key is: make sure the water is not cold and not too hot, see video for an explanation of "tepid" and don't forget to add sugar. The yeast has to "feed" on something (the sugar) to get started.
Ещё видео!