Industrial RO, water softener

Commercial RO


Sand Filter

Sand filter remove physical impurities from the water like sand, silt, hair, dust, rust and mud.

AQUA BREATH SAND FILTER (ABSF)


The Aqua Breath Sand Filter (ABSF) are upper Deep Bed Multigrade Filters that use specially graded sand, proved for industrial and commercial application. The Aqua Breath Sand filters can handle feed water up to <5 NTU turbidity and the treated water from this range of filters will have <2NTU.

Safe drinking water can be reached with this type of sand filters. Thanks to mechanical and biological action in the sand layer, slow gravity sand filters remove bacteria as well as small particles from water, making it safe to drink. This is a basic introduction to the subject and should help maintain a constant supply of clean, running water using simple technology. The sand filter described below is designed for domestic use only.

How the filter works

The water passes through the sand from top to bottom. Larger suspended particles will settle in the top layers of sand. Smaller particles of organic sediment left in the sand filter are eaten by microscopic organisms including bacteria and protozoans which 'stick' in the layers of slime that form around the sand particles. The clean water which passes through the filter is safe to drink. If the grain size is around 0.1mm in diameter, a sand filter can remove all fecal coliforms (bacteria that originate from feces) and virtually all viruses.

Bacteria and viruses are traped in the schmutzdecke. Bacterial and biological activity maximizes in the schmutzdecke but will continue up to 20 cm deep in the sand of the filter bed. A certain minimum level of dissolved oxygen should be present to support the aerobic actions that occur in the bed. After the initial installation of the Sand Filter, the formation of the schmutzdecke and bacterial/biological activity will take some days or weeks depending on the ambient temperature. During this period the processed water is unsafe for human consumption and should not be drunk, or must be filtered in another filter, or disinfected with other means. Water quality tests should be done at a regular intervals until the required standard is reached.

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