Most major water treatment plants in the world use
filter media in the process of producing drinking water.
This web site describes and provides data on the main
types of media commonly used, anthracite, sand, garnet
and support gravel. For each type of media the standard
grades are listed and the hydraulic curves given. A page
is provided where the specification of  filter media is
explained. The advantages of multimedia filtration are
discussed as is the correct way of media installation.