Reply To: Black Residue from Hot Water Heat Home › Forums › Public Forums › General Plumbing › Black Residue from Hot Water Heat › Reply To: Black Residue from Hot Water Heat 23 May 2003 at 11:01 pm #294502 mikeinpaParticipant Did thy check the anode rod in water heater ,magnesium anode may have broken down ,may need to replace rod with alumunium anode ?
