text: The major hardware for an FGD system includes the flue gas duct system , limestone storage ( including loading and conveyer equipment ) , gypsum dewatering and wastewater treatment , gypsum storage , piping , valves , pumps and tanks , electricity supply , controls , instrumentation , pipe bridges and cable channels , and foundations and buildings as needed .
  
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  The major hardware for an FGD system will cost millions of dollars .