1. Treatment processes

1.1 Preparing clear, stable water

Some uses require only water that has been freed of all or part of its suspended solids, inert or living, and that is stable from various points of view, i.e. not susceptible to :

• post-precipitation during use;

• cause interference with storage and distribution materials, due to corrosion or scaling;

• not be subject to bacterial, algal or animal revivification, which presupposes the absence of chemical substances that can act as nutrients (orthophosphates, nitrates) or react with disinfectants (e.g. ammonium and chlorine).

Dissolved pollution, on the other hand, may not be a problem in this category of...