Index: firmware/App/Controllers/BalancingChamber.h
===================================================================
diff -u -r173453569b2eb31b3f19572bf5386440667b0162 -rcb071d7746fea6b6b6698cc9ba0747f2b8501861
--- firmware/App/Controllers/BalancingChamber.h	(.../BalancingChamber.h)	(revision 173453569b2eb31b3f19572bf5386440667b0162)
+++ firmware/App/Controllers/BalancingChamber.h	(.../BalancingChamber.h)	(revision cb071d7746fea6b6b6698cc9ba0747f2b8501861)
@@ -8,7 +8,7 @@
 * @file    BalancingChamber.h
 *
 * @author  (last)      Jashwant Gantyada
-* @date    (last)      30-Jun-2026
+* @date    (last)      29-Jul-2026
 *
 * @author  (original)  Vinayakam Mani
 * @date    (original)  28-Jan-2025
@@ -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 70 mL/min and 80 mL/min.
 
 /// balancing chamber data structure
 typedef struct
@@ -69,13 +76,19 @@
 void valveControlForBCClosedState( void );                               // Closes all balancing chamber valves
 void valveControlForBCOpenState( void );                                 // Open all balancing chamber valves
 void valveControlForBCFreshSideOnlyOpenState( void );                    // Open only fresh side balancing chamber valves
+void valveControlForBCSpentSideOnlyOpenState( void );                    // Open only spent side balancing chamber valves
 BOOL getBalChamberSwitchingOnlyStatus( void );                           // Get balancing chamber switching only status
 void setBalChamberSwitchingOnlyStatus( BOOL OnOff );                     // Set balancing chamber switching only status
 U32 getBalChamberSwitchingPeriod( void );                                // Get balancing chamber switching period
 F32 getBalancingChamberError( void );                                    // Get balancing chamber error to adjust UF rate.
 F32 getBicarbDoseVol( void );                                            // Get liquid bicarb dose volume
 F32 getAcidDoseVol( void );                                              // Get acid dose volume
+<<<<<<< HEAD
 BOOL getBalancingChamberStatus(void);                                    // Get Balancing Chamber Switching Status
+=======
+BOOL isBalChamberSwitchImminent( void );                                 // Get the balancing chamber is within the valve-close window (50 ms) before switching.
+BOOL getBalChamberFreshSideValvesClosedStatus( void );                   // Get the balancing chamber fresh side valve close status
+>>>>>>> origin/staging
 
 BOOL testDDBalChamberDataPublishIntervalOverride( MESSAGE_T *message );  // To override the balancing chamber data publish interval
 BOOL testBalChamberSwFreqOverride( MESSAGE_T *message );                 // To override the balancing chamber switching frequency