Almost all water power sources with under 1 meter fall in the world are unused. That a lot of power! Pulser pumps can use use that power directly for pumping water. Pulser pumps can also provide low pressure air. That in turn can easily be used to wash clothes and dry them. Pulser pumps could also be used to run a wide variety of low powered machines. Pulser pumps are extremely low tech, and low cost - but are they effective?[verification needed] If designed properly, pulser pumps could probably capture a lot of silt clay and sand from rivers too.[verification needed] A medium tech use for low head hydro is a ram pump which is for pumping water. Ram pumps are probably more for smaller (by volume) power sources, are more expensive but give higher efficiencies.