Index: firmware/App/Controllers/DGInterface.h
===================================================================
diff -u -ra7675f3c917b632cf16207fc7ccfc1f38eb83f9b -r7cf04dc00d1242aba62f3cd4e4bcb19f1e83ebc6
--- firmware/App/Controllers/DGInterface.h	(.../DGInterface.h)	(revision a7675f3c917b632cf16207fc7ccfc1f38eb83f9b)
+++ firmware/App/Controllers/DGInterface.h	(.../DGInterface.h)	(revision 7cf04dc00d1242aba62f3cd4e4bcb19f1e83ebc6)
@@ -34,6 +34,7 @@
 
 #define DEFAULT_TARGET_FILL_FLOW_RATE_LPM   0.8F    ///< Default target fill flow rate in L/min.
 #define DRAIN_RESERVOIR_TO_VOLUME_ML        0       ///< Drain reservoir to this volume (in mL) during treatment.
+#define LOAD_CELL_PRIMARY_BACKUP_MAX_ALLOWED_DRIFT_GRAMS  10.0F  ///< Reservoir load cell drift difference allowed
 
 /// DG Concentrate ratios data structure.
 typedef struct
@@ -148,6 +149,7 @@
 F32 getLoadCellWeight( LOAD_CELL_ID_T loadCellID );
 F32 getReservoirWeight( DG_RESERVOIR_ID_T resID );
 F32 getReservoirWeightLargeFilter( DG_RESERVOIR_ID_T resID );
+F32 getReservoirBackupWeightLargeFilter( DG_RESERVOIR_ID_T resID );
 F32 getDialysateTemperature( void );
 DG_DISINFECT_UI_STATES_T getDGDisinfectsStates( void );
 DG_MIXING_RATIOS_T getDGMixingRatios( void );