this is what i am in sri lanka for: bringing locally adapted low cost technology to improve drinking water supply of the people in need, mainly the poor, low caste, incomplete families. the pump you see here consists of material available in the local hardware store, mainly pvc and metal pipes (pvc to avoid corrosion), a glass marble as vent, tire cutouts as gaskets. our partner emas int. has set up a well drilling school to teach this technology. self-employment at least for some is the way to improve their living conditions, others simply profit from the fail-safe and long-lasting technology.