The most common type of conventional filters contain sand, activated carbon, or anthracite coal. These filtration media can remove organic compounds, which contribute to taste and odor. Filters must be cleaned periodically, and this is accomplished as water is passed quickly upward through the filter, opposite the normal flow direction (called backflushing or backwashing) to remove embedded particles. Compressed air may be used to break up the compacted filter media to aid the backwashing process (air scouring). Backwashed solids are usually disposed of along with the sludge from the sedimentation basin.
Pressure filters work on the same principle as rapid gravity filters; the filter medium is enclosed in a steel vessel and the water is forced through it under pressure.
Siemens Water Technologies is a world leader in supplying all types of systems, components, and services for drinking water filtration. Our technologies include:
Siemens also provides pilot treatment systems and analytical testing to document the efficacy of treatment prior to installation. We also provide parts and service on all of our equipment, as well as equipment which may have been provided by other manufacturers.
Municipal Drinking Water Treatment Technologies and Services