Once in place, the filter serves the water needs of one family. The filter is easy to maintain. The
responsibility for doing that falls on the family using it. No wider community organisation is
needed. Experience has shown that the filters are well maintained across the board.
The filter does NOT rely on first world technology. It can be locally produced and, in fact,
requires no intervention or help from anyone in the developed world! Except to perhaps share
the knowledge, impart skill and encourage adoption at the start.
Many who drink river water do so because it is culturally acceptable, even desirable to do so.
The sand filter fits well into this social norm. It even improves the river water by providing
a little cooling.
They are ‘appropriate technology’. They have been shown to work by eliminating deaths due
to Cholera in villages which previously suffered annual Cholera fatalities.