... UNICEF, UNDP and donor nations such as Finland, Denmark, France, Japan, the Netherlands, Australia, Sweden, South Korea and Germany. Looking at urban markets anywhere, we can count more than 20 trade-marks ... runoff, the tides and the depth of bars in the sea in front of the estuaries. Otherwise, in early rainy season, nearly 1,6 million hectares of the delta are infected by the acidity water due to the ... settling tanks and then treated by aluminium sulphate (alum) and sand filter techniques. Finally, chlorination is used as a disinfectant. The purpose of sand filtration is to separate solid and liquid...