New in your room or back from holiday? Let the taps (in your kitchen and bathroom/toilet) run for 5 minutes before using the water. Hang the shower head in a bucket of water so that the water-spray is not atomised.
In case legionella has emerged in the pipes, although the chances are very low, by this method you can prevent getting sick from it.
If you want to know more about legionella, see the link below
