Effect of Fine Sand Size in a Decentralized Household Drinking Water Purification Svstem

Slow sand filtration has been recognized as one of the effective methods of drinking water production in the rural areas of developing countries. In this study, a series of laboratory scale experiments was carried out to study the effects of fine sand size on water filter performance. Two kinds of fine sand, sand A (diameter: 0.5 to 1.l8mm) and sand B (diameter: < l.18mm), were employed during the experiments. The basic experimental unit was an acrylic rectangular tank, 60cm in length, 20cm in width and70 cm in height. Five compartments were arranged in away to maximize