frequently contains suspended matter such as mud, silt,
corrosion product and
Left in the water, this material can
cause problems. These problems can show as the blinding of
a sensor, clogging of a control valve, or deposits in
The process of filtration removes
most suspended matter. Filtration can be done several
The most common filters are media filters, made from
anthracite, sand and
garnet. Other types of filters, such as cartridge filters, sock
filters and strainers are also used.
Filter media choice, filter bed
depth and other design parameters are determined by the quality
of the water and system requirements.
Normally, a backwashing filter
would be followed by a fine cartridge filter for the best results.
The backwashing filter can take high solids
loading before flows are reduced and can be self cleaning.
The polishing filter insures any residual
material does not get through.