Index: firmware/App/DDCommon.h
===================================================================
diff -u -r2a1296e1269e7c36dd07cb0f39b70b742f6de405 -r977f03e20990ed5579160b9b927df1c0f2428101
--- firmware/App/DDCommon.h	(.../DDCommon.h)	(revision 2a1296e1269e7c36dd07cb0f39b70b742f6de405)
+++ firmware/App/DDCommon.h	(.../DDCommon.h)	(revision 977f03e20990ed5579160b9b927df1c0f2428101)
@@ -54,6 +54,9 @@
 //Uncomment below once characterization/study completed
 //#define ENABLE_ALARM_2
 
+//Uncomment below for spent chamber filling
+#define __SPENT_CHAMBER_FILL__    1
+
 //Uncomment below if balancing chamber pressure alarm is required
 #define __BC_PRESSURE_ALARM__     1