Index: firmware/App/Controllers/BalancingChamber.h
===================================================================
diff -u -r42541cc4700d748d524400f61d99e288a0e11f3e -rc53b6d8d57bd64bcfedf8a1bbb0d0eeab4502971
--- firmware/App/Controllers/BalancingChamber.h	(.../BalancingChamber.h)	(revision 42541cc4700d748d524400f61d99e288a0e11f3e)
+++ firmware/App/Controllers/BalancingChamber.h	(.../BalancingChamber.h)	(revision c53b6d8d57bd64bcfedf8a1bbb0d0eeab4502971)
@@ -39,6 +39,13 @@
 #define BC_SPENT_FILL_PRESSURE_PSIG                 29.0F              ///< Spent side pressure (drop) during balancing chamber switching, indicates fill has been started / in progress.
 #define BAL_CHAMBER_FILL_VOLUME_ML                  30.0F              ///< Balancing chamber fill/drain volume per batch operation.
 #define BAL_CHAMBER_TIME_BASED_D48_SPEED_RPM        250                ///< Minimum D48 speed and fixed speed for time-based balancing chamber switching.
+#define BAL_CHAMBER_OPEN_LOOP_FLOW_RATE_BAND_1      50.0F              ///< Band 1 flowrate(50 mL/min)
+#define BAL_CHAMBER_OPEN_LOOP_FLOW_RATE_BAND_2      60.0F              ///< Band 2 flowrate(60 mL/min)
+#define BAL_CHAMBER_OPEN_LOOP_FLOW_RATE_BAND_3      70.0F              ///< Band 3 flowrate(70 mL/min)
+#define BAL_CHAMBER_OPEN_LOOP_FLOW_RATE_BAND_4      80.0F              ///< Band 4 flowrate(80 mL/min)
+#define BAL_CHAMBER_TIME_BASED_BAND_1               250                ///< Speed at D48 pump runs when the flowrate is between 50 mL/min and 60 mL/min.
+#define BAL_CHAMBER_TIME_BASED_BAND_2               290                ///< Speed at D48 pump runs when the flowrate is between 60 mL/min and 70 mL/min.
+#define BAL_CHAMBER_TIME_BASED_BAND_3               330                ///< Speed at D48 pump runs when the flowrate is between 80 mL/min and 80 mL/min.
 
 /// balancing chamber data structure
 typedef struct