large enough to last the coming years. it s in the pools with a wall of concrete so that impermeable basically will line them with clay soil from the village so not because the top system was a little expensive. and we prefer to use local materials. the senate haitian project is unique in the valley and is probably the only one in the high atlas the lagoon purification technique usually works well but it depends a lot on the sites climatic conditions at one thousand six hundred metres above sea level temperatures can drop below freezing and alter the purification process. the village of t.-z. will serve as a pilot site for this type of treatment system if the experiment succeeds the systems low cost could spur development in other villages.