Index: firmware/App/Modes/ModeFill.c
===================================================================
diff -u -rd32f890bb6c238c95bcaca54da79d7aa4a1898cb -r506f3f58a353093e1482db57bb1210e3b1cdc128
--- firmware/App/Modes/ModeFill.c	(.../ModeFill.c)	(revision d32f890bb6c238c95bcaca54da79d7aa4a1898cb)
+++ firmware/App/Modes/ModeFill.c	(.../ModeFill.c)	(revision 506f3f58a353093e1482db57bb1210e3b1cdc128)
@@ -606,6 +606,8 @@
     // to dialysate production directly
     if ( TRUE == isThisTheFirstFill() )
     {
+        resetChemicalUsedVolumeML( BICARB );
+        resetChemicalUsedVolumeML( ACID );
         result = DG_FILL_MODE_STATE_PRIME_CONCENTRATE_LINES;
     }
     else