We design, build, operate and test slow sand water filters. Our speciality is consultation. We have 8 years of experience in the design, testing and operation phase. Our focus involves the filtration and purification of rain water, roof water, and shallow well water. We currently have 5 fully operational prototypes running. The longest running filter has 8 years of service and is still running successfullyl with the original sand and gravel as filter media.