Index: firmware/App/Controllers/SpentChamberFill.c
===================================================================
diff -u -r0a1d4f769464407084d39843244af74911bbdfa5 -ra7014f4b673da08de179efcdf68ac8c854fe5757
--- firmware/App/Controllers/SpentChamberFill.c	(.../SpentChamberFill.c)	(revision 0a1d4f769464407084d39843244af74911bbdfa5)
+++ firmware/App/Controllers/SpentChamberFill.c	(.../SpentChamberFill.c)	(revision a7014f4b673da08de179efcdf68ac8c854fe5757)
@@ -39,7 +39,7 @@
 // ********** private definitions **********
 
 #define SPENT_CHAMBER_FILL_DATA_PUBLISH_INTERVAL           ( 250 / TASK_GENERAL_INTERVAL )      ///< Interval (ms/task time) at which the balancing chamber data published.
-#define SPENT_CHAMBER_SWITCHING_PERIOD                     59                                   ///< Spent Chamber Fill Switching Period
+#define SPENT_CHAMBER_SWITCHING_PERIOD                     59                                   ///< Spent Chamber Fill Switching Period to max dialysate flow rate (Qd: 600) to stabilize the valve closure
 
 // ********** private data **********
 
@@ -97,7 +97,7 @@
 {
     initSpentChamberFill();
     updateBalChamberSwitchingPeriod();
-    // Follow the same cycle for spent chamber fill
+    // Update the Switching Period to max dialysate flow rate(Qd: 600) for filling spent chamber at max rate.
     spentChamberFillSwitchingPeriod = SPENT_CHAMBER_SWITCHING_PERIOD;
 }
 
@@ -287,6 +287,7 @@
 static SPENT_CHAMBER_FILL_EXEC_STATE_T handleSpentChamberState1DosingControl( void )
 {
     SPENT_CHAMBER_FILL_EXEC_STATE_T state = SPENT_CHAMBER_FILL_STATE1_DOSING_CNTRL;
+
     // On dosing completion, transition to next state
     if ( ( TRUE == isConcentratePumpDosingCompleted( D11_PUMP ) ) &&
          ( TRUE == isConcentratePumpDosingCompleted( D10_PUMP ) ) )