Hi a  friend   is in the process of  selling their house  and  in testing the 
drilled 250' deep well  it has come up with a  higher than acceptable level of  
bacteria .  A well company is planning to shock the well  with Chlorine which 
will cost them  around $300 dollars .  I wonder if  there is a way that  a few 
gallons of  CS could have be used ?   .   They think that the well might have  
got contaminated by surface water that  got in when the  well head casing  was 
damaged by a riding lawn mower  and later repaired . I checked the  archives 
but the  post that came up about polluted wells seem to be suggesting using 
some sort of water treatment  filters.   Anyone have any experience  using CS 
for this purpose?  Thanks Alan