But, isn’t SODIS less expensive and more sustainable because it used locally available materials?
• If the poor purchase SODIS bottles, on a cost per liter basis, SODIS water storage costs 4 to 10 times more than permanent water storage that is available locally. • In the developing world the poor are a majority, and SODIS makes them dependent on rich man’s trash in order to be sustainable if they do not purchase their own bottles.
