Index: firmware/App/Controllers/BalancingChamber.c
===================================================================
diff -u -rc1557cc79c8f0b0c358963c99d83015bd3b37e42 -r67d2fdfc9ec326b98b5a0ac2dbfcee283c8791af
--- firmware/App/Controllers/BalancingChamber.c	(.../BalancingChamber.c)	(revision c1557cc79c8f0b0c358963c99d83015bd3b37e42)
+++ firmware/App/Controllers/BalancingChamber.c	(.../BalancingChamber.c)	(revision 67d2fdfc9ec326b98b5a0ac2dbfcee283c8791af)
@@ -748,6 +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
Index: firmware/App/Controllers/BalancingChamber.h
===================================================================
diff -u -rc1557cc79c8f0b0c358963c99d83015bd3b37e42 -r67d2fdfc9ec326b98b5a0ac2dbfcee283c8791af
--- firmware/App/Controllers/BalancingChamber.h	(.../BalancingChamber.h)	(revision c1557cc79c8f0b0c358963c99d83015bd3b37e42)
+++ firmware/App/Controllers/BalancingChamber.h	(.../BalancingChamber.h)	(revision 67d2fdfc9ec326b98b5a0ac2dbfcee283c8791af)
@@ -76,6 +76,7 @@
 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
Index: firmware/App/Controllers/DryBiCart.c
===================================================================
diff -u -rc1557cc79c8f0b0c358963c99d83015bd3b37e42 -r67d2fdfc9ec326b98b5a0ac2dbfcee283c8791af
--- firmware/App/Controllers/DryBiCart.c	(.../DryBiCart.c)	(revision c1557cc79c8f0b0c358963c99d83015bd3b37e42)
+++ firmware/App/Controllers/DryBiCart.c	(.../DryBiCart.c)	(revision 67d2fdfc9ec326b98b5a0ac2dbfcee283c8791af)
@@ -46,7 +46,7 @@
 #define DRY_BICART_DATA_PUBLISH_INTERVAL                ( 250 / TASK_GENERAL_INTERVAL )             ///< Interval (ms/task time) at which the drybicart data published.
 #define WCDI2_PRESSURE_OFFSET_PSI                        7.0F                                       ///< The difference between the actual pressure measured at bicart assembly and the measured D66 pressure based on the placement of the sensor for WCID1
 #define WCID1_PRESSURE_OFFSET_PSI                        1.0F                                       ///< The difference between the actual pressure measured at bicart assembly and the measured D66 pressure based on the placement of the sensor for WCID2
-#define DRY_BICART_PERSISTENCE_DURATION_MS              500                                         ///< Fill persistence duration to overcome the pressure overshoot/ drop for beta 1.9 and above.
+#define DRY_BICART_PERSISTENCE_DURATION_MS               500                                        ///< Fill persistence duration to overcome the pressure overshoot/ drop for beta 1.9 and above.
 //#define DRY_BICART_FILL_PERSISTENCE_DURATION_MS         ( 1 * MS_PER_SECOND )                       ///< Fill persistence duration  to overcome the pressure overshoot/ drop for beta 1.9 and above.
 
 // Dry Bicart Fill
@@ -57,7 +57,7 @@
 #define GET_FILL_COMPLETE_PRESSURE_PSI (getTestConfigStatus( TEST_CONFIG_DD_ENABLE_WCID_1 ) != TRUE ? \
         DRY_BICART_WCID2_FILL_COMPLETE_PRESSURE_PSI : DRY_BICART_WCID1_FILL_COMPLETE_PRESSURE_PSI ) ///< Get fill complete pressure based on the WCID configuration
 #define DRY_BICART_FILL_INITIATE_PRESSURE_PSI           1.5F                                        ///< Minimum pressure required to initiate the dry bicart fill process.
-#define DRY_BICART_FILL_COMPLETE_SUPPLY_PRESSURE_PSI  10.0F                                         ///< Maximum pressure allowed at bicart fill during supply process/state
+#define DRY_BICART_FILL_COMPLETE_SUPPLY_PRESSURE_PSI    10.0F                                       ///< Maximum pressure allowed at bicart fill during supply process/state
 #define DRY_BICART_FILL_INITIATE_SUPPLY_PRESSURE_PSI    4.0F                                        ///< Minimum pressure required to initiate the dry bicart fill during supply process/state
 #define DRY_BICART_MAX_FILL_CYCLE_CNT                   10                                          ///< Max fill cycle allowed (by override) for dry bicart fill/mix with water.
 #define DRY_BICART_MINIMUM_FILL_CYCLE_CNT               3                                           ///< Minimum fill cycle count for filling dry bicart
@@ -169,6 +169,7 @@
 static BICARB_CHAMBER_FILL_EXEC_STATE_T handleBicarbChamberPressureCheckState( void );
 static BICARB_CHAMBER_FILL_EXEC_STATE_T handleBicarbChamberSupplyVentStartState(void);
 static BICARB_CHAMBER_FILL_EXEC_STATE_T handleBicarbChamberSupplyVentEndState(void);
+static BICARB_CHAMBER_FILL_EXEC_STATE_T completeBicarbChamberFillToIdle( void );
 static BOOL isDryBicartChamberFillWindowOpen( void );
 static void closeD65IfBalChamberSwitchImminent( void );
 // Drain
@@ -1188,8 +1189,8 @@
             setValveState( D65_VALV, VALVE_STATE_CLOSED );
             dryBiCartPersistenceStartTime = 0;
 
-            //state = BICARB_CHAMBER_SUPPLY_STATE;
-            state = BICARB_SUPPLY_VENT_END_STATE;
+            // Return to idle
+            state = completeBicarbChamberFillToIdle();
 
         }
     }
@@ -1201,8 +1202,8 @@
     //Additional code
     if ( LVL_STATE_LOW == bicarbChamberLevel )
     {
-        //Force transition to end state to allow next supply
-        state = BICARB_SUPPLY_VENT_END_STATE;
+        // Force return to idle to allow next supply
+        state = completeBicarbChamberFillToIdle();
     }
 
     return state;
@@ -1386,25 +1387,39 @@
 
 /*********************************************************************//**
  * @brief
- * The handleBicarbChamberSupplyVentEndState function actuates the vent valve
- * present in the Bicart assembly.
- * @details \b Inputs: dryBiCarbSypplyVentStartTime
- * @details \b Outputs: bicarbChamberFillRequested
- * @return the next bicarb chamber start state.
+ * The completeBicarbChamberFillToIdle function clears bicarb chamber fill
+ * request and returns the bicarb chamber fill state machine to start.
+ * @details \b Inputs: none
+ * @details \b Outputs: bicarbChamberFillRequested, dryBiCartPressureDecayStartTimeFlag,
+ * dryBicartStartRequest
+ * @return BICARB_CHAMBER_START_STATE
  *************************************************************************/
-static BICARB_CHAMBER_FILL_EXEC_STATE_T handleBicarbChamberSupplyVentEndState(void)
+static BICARB_CHAMBER_FILL_EXEC_STATE_T completeBicarbChamberFillToIdle( void )
 {
-    BICARB_CHAMBER_FILL_EXEC_STATE_T state  = BICARB_SUPPLY_VENT_END_STATE;
+    BICARB_CHAMBER_FILL_EXEC_STATE_T state = BICARB_CHAMBER_START_STATE;
 
-    bicarbChamberFillRequested.data = FALSE;
+    bicarbChamberFillRequested.data   = FALSE;
     // for this request override also cleared
     bicarbChamberFillRequested.ovData = FALSE;
 
     dryBiCartPressureDecayStartTimeFlag = FALSE;
+    dryBicartStartRequest               = DRY_BICART_IDLE;
 
-    state = BICARB_CHAMBER_START_STATE;
+    return state;
+}
 
-    dryBicartStartRequest = DRY_BICART_IDLE;
+/*********************************************************************//**
+ * @brief
+ * The handleBicarbChamberSupplyVentEndState function completes bicarb chamber
+ * fill to idle. Kept for any residual VentEnd transitions; prefer calling
+ * completeBicarbChamberFillToIdle() directly from FillWater/Vent completion.
+ * @details \b Inputs: none
+ * @details \b Outputs: bicarbChamberFillRequested, dryBicartStartRequest
+ * @return the next bicarb chamber start (idle) state.
+ *************************************************************************/
+static BICARB_CHAMBER_FILL_EXEC_STATE_T handleBicarbChamberSupplyVentEndState(void)
+{
+    BICARB_CHAMBER_FILL_EXEC_STATE_T state = completeBicarbChamberFillToIdle();
 
     return state;
 }
Index: firmware/App/Monitors/Conductivity.c
===================================================================
diff -u -rfc6a157a48debd4ee8c2fb8dec8af21f5b07abe2 -r67d2fdfc9ec326b98b5a0ac2dbfcee283c8791af
--- firmware/App/Monitors/Conductivity.c	(.../Conductivity.c)	(revision fc6a157a48debd4ee8c2fb8dec8af21f5b07abe2)
+++ firmware/App/Monitors/Conductivity.c	(.../Conductivity.c)	(revision 67d2fdfc9ec326b98b5a0ac2dbfcee283c8791af)
@@ -41,7 +41,7 @@
 #define RO_DATA_PUBLISH_COUNTER_START_COUNT                 42                                                          ///< FP RO Data publish counter start count.
 #define RESISTANCE_DATA_PUBLISH_COUNTER_START_COUNT         43                                                          ///< DD Resistance data publish counter start count.
 #define CONDUCTIVITY_MAX_FILTER_SIZE_MULTIPLIER  ( 252 )                                                                ///< Maximum conductivity filter sample count (At 50qd, we switch once for every 36sec, so 36 * FILTER_SIZE_MULTIPLIER = 252).
-#define CONDUCTIVITY_TEMP_SAMPLE_FILTER_MS      ( 30 )                                                                  ///< Filter conductivity temperature data for given time. Currently set to have 5 samples over 3.5s ( 700ms sample rate )
+#define CONDUCTIVITY_TEMP_SAMPLE_FILTER_MS      ( 3 * TASK_PRIORITY_INTERVAL )                                          ///< Conductivity temperature filter scale (ms). Rolling avg size = FILTER_MS / TASK_PRIORITY_INTERVAL = 3 samples (3 * TASK_PRIORITY_INTERVAL(10) = 30). At 700 ms sensor update rate, 3 * 700 ms ≈ 2.1 s window.
 #define FILTER_SIZE_MULTIPLIER                  ( 7 )                                                                   ///< Conductivity filter size multiplier.
 #define SIZE_OF_COND_TEMP_ROLLING_AVG           ( CONDUCTIVITY_TEMP_SAMPLE_FILTER_MS / TASK_PRIORITY_INTERVAL )         ///< Filtered conductivity temprature moving average sample count.
 #define RO_RR_MOVING_AVG_NUM_OF_SAMPLES         30                                                                      ///< RO rejection ratio moving average number of samples.