Hello Charles,So far the Slow ...

Hello Charles, So far the Slow Sand filter is used to purify water at the stage of the Householder ,As you mentioned the Food challenge governs the farmers toward using the Agro-chemicals in order to maximize the crop yields for both to satisfaction of Food Demands and to upgrade the Economy of the most of the developing countries .The Technical restriction ,poor institutions and luck of strategical planning in the Developing countries Slowing down the utilization of the new technologies that would maximize the crops production and minimize the hazard of Agro -chemicals .