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		 i have to question what is rusting? 
isn't the tank in the water heater 
essentially a big Glass Bottle? 
 
there has to be an iron pipe somewhere 
that's rusting...  maybe supply lines out 
under the street...?  then you say  hmmmmm 
how about replacing the filter then 
because it should not be able to get thru a 
modern charcoal filter.  "just my thoughts" 
		
		
		
		
		
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