Index: firmware/App/Controllers/DGInterface.h
===================================================================
diff -u -rde5a0d43bdef611d963d11855bc958a8d8899a09 -r975a29bff552a9e657364bd36b11c4d491cf7fae
--- firmware/App/Controllers/DGInterface.h	(.../DGInterface.h)	(revision de5a0d43bdef611d963d11855bc958a8d8899a09)
+++ firmware/App/Controllers/DGInterface.h	(.../DGInterface.h)	(revision 975a29bff552a9e657364bd36b11c4d491cf7fae)
@@ -32,8 +32,12 @@
 
 // ********** public definitions **********
 
-#define DRAIN_RESERVOIR_TO_VOLUME_ML        200                 ///< Drain reservoir to this volume (in mL) during treatment.
-#define FILL_RESERVOIR_TO_VOLUME_ML         1700                ///< Fill reservoir to this volume (in mL) during treatment.
+#define DRAIN_RESERVOIR_TO_VOLUME_ML        200                 ///< Drain reservoir to this volume (in mL) during treatment.
+#ifndef V1_5_SYSTEM
+#define FILL_RESERVOIR_TO_VOLUME_ML         1700                ///< Fill reservoir to this volume (in mL) during treatment.
+#else
+#define FILL_RESERVOIR_TO_VOLUME_ML         1300                ///< Fill reservoir to this volume (in mL) during treatment.
+#endif
 
 /// Enumeration of DG reservoirs.
 typedef enum DG_Reservoirs