Sand filtration is one of the oldest wastewater treatment technologies known. If properly designed, constructed, operated
and maintained, a sand filter produces a very high quality effluent. Sand filters are beds of granular material, or sand,
drained from underneath so that pretreated water and wastewater can be treated, collected and distributed to the land
Carbon filters uses Granular activated charcoal removes Colours, Bad Odours, Dissolved Organic impurities and other
chemicals that are dissolved in water passing through a filter containing GAC by trapping the chemical in the GAC. However,
other chemicals, like sodium or nitrate, are not attracted to the carbon and are not removed. Eventually, the ability of the
GAC to bind and remove chemicals is used up and new, or regenerated, GAC is needed.