If the gas does not start to bubble through the airlock, then loosen the top and have a look inside.
The wash should be bubbling and will probably have a foam or froth on top.
If the wash is not bubbling and there is no froth around the top of the wash then check that the temperature is within the recommended range.
A vigorous stir at this stage with a sterilised paddle (not wooden) will speed up the fermentation process.
Stir gently to start with, to avoid a froth build-up.
If for any reason something has not gone to plan, don’t worry too much.
