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The best thing is to have different sizes of ram pumps for different flow ranges for you to chose from. For 30 liters/min a 1" ram is the best. With a 6 meter fall and a delivery head of just 26 meters, you should be able to get 4.6 liters/min or 6650 liters per day on top of the hill. Have the problems been solved in the meantime? I'm working with AIDFI in the Philippines and are installing our own model ram pump. We have ten different sizes. Sometimes, with the source varying over the seasons, it is a good idea to place two pumps in parallel. This was already suggested by Col Binay Kumar.