Keystones of potable water hygiene

At least three basic requirements are to be applied to potable water supply systems:

• Usage comfort – water quantity, temperature and sound protection
• System operation and value preservation – safe, sustainable, energy-efficient
• Maintaining water quality

The first two requirements are the classical goals, while the last one only came into focus in recent years. As a foodstuff, potable water has something like an ‘expiry date’ – that is the point in time when its quality at a given extraction point no longer satisfies the requirements of potable water. Therefore planning specialists and trade professionals must know the major influencing factors for maintaining water quality and consider them in their respective areas of responsibility.

Essentially, this applies to all performance items up to and including handing over the necessary documents and provision of instruction regarding the plant’s functions. Comprehensive and clear documentation explains how the plant is to be operated and maintained properly and also clarifies the legal situation for specialist planners and trade professionals if situations should arise involving compensation claims.

To rule out critical propagation of legionella bacteria in potable water supply systems, the latter should be planned, implemented and operated in such a way that the following thermal and hydraulic conditions in accordance with the Interdependency triangle - potable water quality. This applies to all individual stages.