Filtration is undoubtedly, the most important basic treatment for water and mechanical treatment applied to water.
Filtration,
often, is followed or preceded by many other chemical-physical or
biological treatments that take part in the other characteristics of
the water.
The settleable substances, in virtue of their
chemical-physical nature, of the specific weight and dimensions, tend
to separate themselves from water spontaneously and to deposit
themselves at the bottom in different times.
On the other hand,
suspended substances manage to separate themselves spontaneously just
after a very long time or, don’t separate themselves at all. Suspended
substances are, for example, colloidal substances, fine clay, organic
substances generally, soaps, rubber particles, glues etc.
The choice of filtration speed, of filter beds composition, of filtering mineral washing system, establish the efficiency of the filtration process for the different applications.