Hi Am San You from Water and Healthcare Foundation. We are working on delivery of clean water to 500 schools in Kampong Chhnang Province of Cambodia. We use clean water system which use gravity flow filtration (Ultrafilteration). The water source could be from well, pond and river. To pump the water from the source we are using modified water pump with bike cycle driven up to 3 meters height. Right now were looking for a new product ( Bikecycle pump) which has the same concept to our pump. If your company could make it base on what we have, then it will be perfect. We want to buy many of the them. Thanks. Attached some picture.