Sand Carbon Filter

Sand filters are widely used in water purification and remove suspended matter by a completely different mechanism. Instead of the water passing through small orifices through which particles cannot pass, it runs through a bed of filter medium, typically 0.75 mm sand 750 mm deep. The orifices between such sand particles are relatively large, but dirt is adsorbed onto the large surface area presented by the medium. The pressure loss rises as the dirt builds up and the filter must be cleaned when it reaches about 3 m WC, otherwise the dirt can be pushed right through the filter.

Carbon is a commonly-used medium in water filtration processes. In fact, nearly every type of water filter system--whether it's a backpacking water filter, refrigerator filter, shower filter, pitcher filter, reverse osmosis water filtration system or whole-house filter--utilizes carbon filtration in some way.

Carbon filters for water filtration are produced by grinding up a carbon source.

This carbon source could be:

• Bituminous coal
• Peat
• Coconut shells Of the above-mentioned carbon sources, coconut shells are the most widely used and are highly renewable.