Type 3 buildings are identifiable as being buildings that have vacant periods that can last many weeks at a time. This is the case with, for example, schools and nurseries, due to long weekends and holidays.

Seasonal hotels, trade fair halls, barracks and event rooms have vacant periods of many days, weeks or even months. But at the same time, the water quality of such buildings is under close scrutiny due to use by the public.

To ensure the prevention of stagnation, automatic flushing with flush module at the end of each storey pipe system is advisable. In this case, a pre-set flushing volume, which corresponds to the stagnating water volume, should be flushed through the system. However, a 24-hour urinal flushing system can also be of benefit in Type 3 buildings.

With Type 3 buildings, flushing measures that are coordinated as per demand and volume are wise as these work in an automated way which conserves resources:

• When used regularly, no mandatory flush occurs.
• The flush programmes recognise interruptions in use and flush the pre-set volume of water in the pre-stored in the pipes on the storey.
• The water quality is maintained, drinking and waste water costs are kept to a minimum.