Index: firmware/App/Controllers/BalancingChamber.c
===================================================================
diff -u -r9e0db1f82f13693d251e00e8958c8063dd89cae6 -r7a9cfc7590be84e1c4af6a04ca92c598d49cf9de
--- firmware/App/Controllers/BalancingChamber.c	(.../BalancingChamber.c)	(revision 9e0db1f82f13693d251e00e8958c8063dd89cae6)
+++ firmware/App/Controllers/BalancingChamber.c	(.../BalancingChamber.c)	(revision 7a9cfc7590be84e1c4af6a04ca92c598d49cf9de)
@@ -7,8 +7,8 @@
 *
 * @file    BalancingChamber.c
 *
-* @author  (last)      Santhosh Reddy
-* @date    (last)      06-Jul-2026
+* @author  (last)      Jashwant Gantyada
+* @date    (last)      29-Jul-2026
 *
 * @author  (original)  Vinayakam Mani
 * @date    (original)  28-Jan-2025
@@ -66,9 +66,9 @@
 #define BC_BICARB_SPEED_OFFSET_MLPM                 240.0F                                      ///< Bicarb speed formula offset (mL/min).
 #define BC_BICARB_SPEED_DISC_CONST                  230400.0F                                   ///< Bicarb speed formula discriminant constant.
 #define BC_BICARB_SPEED_DISC_VOL_COEF               96000.0F                                    ///< Bicarb speed formula volume coefficient.
-#define BC_ACID_SPEED_OFFSET_MLPM                   160.0F
-#define BC_ACID_SPEED_DISC_CONSTANT                 102400.0F
-#define BC_ACID_SPEED_DISC_VOL_COEF                 96000.0F
+#define BC_ACID_SPEED_OFFSET_MLPM                   160.0F                                      ///< Acid speed formula offset (mL/min).
+#define BC_ACID_SPEED_DISC_CONSTANT                 102400.0F                                   ///< Acid speed formula discriminant constant.
+#define BC_ACID_SPEED_DISC_VOL_COEF                 96000.0F                                    ///< Acid speed formula volume coefficient.
 
 /// Payload record structure for balancing chamber switch only request
 typedef struct
@@ -223,9 +223,8 @@
  * @param acidVolumeMl Instantaneous acid mix volume (mL)
  * @return Acid concentrate pump speed (mL/min)
  *************************************************************************/
-static F32 getAcidConcentratePumpSpeedMlMin( F32 acidVolumeMl)
+static F32 getAcidConcentratePumpSpeedMlMin( F32 acidVolumeMl )
 {
-
     F32 discriminant = BC_ACID_SPEED_DISC_CONSTANT - ( BC_ACID_SPEED_DISC_VOL_COEF * acidVolumeMl );
     F32 result       = 0.0F;
 
@@ -466,9 +465,9 @@
 {
     BOOL state = FALSE;
     F32 dialFlowRate = getBalChamberActiveDialysateFlowrate();
-    //state = ( getD48PumpSpeed() <= BAL_CHAMBER_TIME_BASED_D48_SPEED_RPM ) ? TRUE : FALSE;
-    state = ( dialFlowRate <= BAL_CHAMBER_OPEN_LOOP_FLOW_RATE_BAND_3 )? TRUE : FALSE;
 
+    state = ( dialFlowRate <= BAL_CHAMBER_OPEN_LOOP_FLOW_RATE_BAND_4 )? TRUE : FALSE;
+
     return state;
 }
 
@@ -749,6 +748,29 @@
 
 /*********************************************************************//**
  * @brief
+ * The valveControlForBCSpentSideOnlyOpenState function opens the spent side
+ * balancing chamber valves and closes the fresh side valves.
+ * @details \b Inputs: none
+ * @details \b Outputs: valve states
+ * @return none.
+ *************************************************************************/
+void valveControlForBCSpentSideOnlyOpenState( void )
+{
+    // Open spent side valves D23,D24,D25,D26
+    setValveState( D23_VALV, VALVE_STATE_OPEN );
+    setValveState( D25_VALV, VALVE_STATE_OPEN );
+    setValveState( D24_VALV, VALVE_STATE_OPEN );
+    setValveState( D26_VALV, VALVE_STATE_OPEN );
+
+    // Close fresh balancing chamber valves D19,D20,D21,D22
+    setValveState( D19_VALV, VALVE_STATE_CLOSED );
+    setValveState( D20_VALV, VALVE_STATE_CLOSED );
+    setValveState( D21_VALV, VALVE_STATE_CLOSED );
+    setValveState( D22_VALV, VALVE_STATE_CLOSED );
+}
+
+/*********************************************************************//**
+ * @brief
  * The valveControlForBCState1FreshSideClose function closes only the fresh-side
  * balancing chamber valves opened during state 1 fill.
  * @details \b Inputs: none