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 Where is the fresh top up water stored. Even though the ATO is shut off, is there any possiblility that a siphon is occurring from  the  TO water into the sump when the sump level drops from evaporation.  I know it's a long shot but worth checkiing 
				__________________-captainhemo
 			 Last edited by Captainhemo; 09-28-2010 at 08:32 PM.
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