DOMESTIC WATER

The multimedia filter in water filtration is the most common method of water filtration. These filters contain multiple layers of media through which water flows. Each layer is progressively sized in coarseness and layer depth. The media layers are stacked such that the layer to remove the coarsest and densest media, usually gravel, is at the bottom. The layer to remove lighter, finer media is at the top.

The multimedia filter reduces the level of suspensions in the feed water. Suspended solids in a water stream usually include small particles such as silt, clay, organic matter, grit, algae, and other microorganisms. These can be effectively taken out using multi media filters (sand, anthracite & carbon media).

The filtered water will be clear and odourless, however there persists the risk of bacterial contamination. To prevent this, dosing chlorine within permissible limit (0.3-0.5 ppm) and maintaining this reserve will ensure that the water will be free of bacterial contamination. Hence, in commercial buildings, the water will be dosed automatically with sodium hypochlorite (with a free chlorine content of 7-10%), using controller and dosing pump.