Opportunity:  This is a addunum to a concept already published in the
              document reffered to ...viz. design for a water filter

              ...it has been referred to use fly-ash for filtering water

              inlieu ...even ash derived out of cow/buffalo dung [ ....along
              with sand ] can also be used.
              
 Note: The above problem statement having been encountered in various scenarios
      and detailed in various 'Proof of concepts' as mentioned in 
      
       http://uk.geocities.com/ravivenkatus/projects.pdf
       http://ravishankarkv.tripod.com/projects.pdf
        ....apply appropriate
      'use-case' modeling, rationalize and arrive at a workable and feasible 
       solution both commercially and techinically viable.


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