I work for a water NGO in Uganda and am currently drilling deep boreholes (50-90m on average) in the Albertine rift valley area. I have found many of the boreholes near to the the lake have a very high salt content. I have been looking into alternatives, eg using tanks, but most of the housing is grass roofed plus rainfall is very seasonal, so boreholes remain the only option.

Does anyone know of a good pump or filter system to deal with this problem? I gratefully welcome any suggestions.