Services

Media Filtration

CRS can provide media filtration solutions for various civil, industrial and municipal applications. These systems can be fully customised with common features such as automated backwashing and multi-filter configurations for continuous operation.

Filtration processes are used primarily to remove suspended particulate material from water and are typically used in the production of potable water. Particulates removed by media filtration include clay and silt particles, microorganisms, colloidal and precipitated humic substances, precipitates of iron or aluminium from coagulation and calcium carbonate and magnesium hydroxide precipitates from lime softening.

Filtration can be described as depth filtration if the solids are removed within the granular material, or cake filtration if the solids are removed on the entering face of the granular material. Rapid granular bed filters are of the depth type, while pre-coat and slow sand filters are of the
cake type.

A variety of depth filter media is available depending upon the application. These include:

Sand:
Particulate filtration.
Anthracite:
Particulate filtration.
Calcite:
Used as a sacrificial calcium carbonate for pH correction.
Granular Activated Carbon:
Used for the adsorption of chlorine and organics.
Multi-Media:
Particulate filtration.
Manganese Greensand:
Particulate filtration and iron removal.
Aluminium Silicate:
More porous and less dense than sand thus requiring lower backwashing rates.

media filtration2

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