Index: firmware/App/Modes/ModeStandby.c
===================================================================
diff -u -rbd8fa3f754c8a8fd797d1828c416f73680924b64 -r64f7d82ff6637d6fb179d31b0c1481d68ed99143
--- firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision bd8fa3f754c8a8fd797d1828c416f73680924b64)
+++ firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision 64f7d82ff6637d6fb179d31b0c1481d68ed99143)
@@ -21,6 +21,7 @@
 #include "Heaters.h"
 #include "ModeStandby.h"
 #include "OperationModes.h"
+#include "Pressures.h"
 #include "Reservoirs.h"
 #include "ROPump.h"
 #include "SystemComm.h"
@@ -53,13 +54,16 @@
 static U32 waterSampleStartTime = 0;                                        ///< Time stamp for start of water sample state.
 static U32 filterFlushStartTime = 0;                                        ///< Time stamp for start of filter flush state.
 static U32 filterFlushPublishTimerCounter = 0;                              ///< Filter flush data publish timer counter.
+/// Filter flush time period in ms.
+static OVERRIDE_U32_T filterFlushTimePeriod = { FILTER_FLUSH_TIME_MS, FILTER_FLUSH_TIME_MS, 0, 0 };
 
 // ********** private function prototypes **********
 
 static DG_STANDBY_MODE_STATE_T handleStandbyIdleState( void );
 static DG_STANDBY_MODE_STATE_T handleStandbyFlushFilterState( void );
 static DG_STANDBY_MODE_STATE_T handleStandbyFlushFilterIdleState( void );
 static DG_STANDBY_MODE_STATE_T handleStandbySampleWaterState( void );
+static U32 getFilterFlushTimePeriod( void );
 
 /*********************************************************************//**
  * @brief
@@ -204,17 +208,18 @@
 static DG_STANDBY_MODE_STATE_T handleStandbyFlushFilterState( void )
 {
     DG_STANDBY_MODE_STATE_T state = DG_STANDBY_MODE_STATE_FLUSH_FILTER;
+    U32 const filterFlushTimePeriod_ms = getFilterFlushTimePeriod();
 
     checkInletPressure();
 
-    if ( TRUE == didTimeout( filterFlushStartTime, FILTER_FLUSH_TIME_MS ) )
+    if ( TRUE == didTimeout( filterFlushStartTime, filterFlushTimePeriod_ms ) )
     {
         state = DG_STANDBY_MODE_STATE_FLUSH_FILTER_IDLE;
     }
 
     if ( FILTER_FLUSH_DATA_PUBLISH_INTERVAL <= filterFlushPublishTimerCounter++ )
     {
-        U32 const timeout = FILTER_FLUSH_TIME_MS / MS_PER_SECOND;
+        U32 const timeout = filterFlushTimePeriod_ms / MS_PER_SECOND;
         U32 const countdown = timeout - ( calcTimeSince( filterFlushStartTime ) / MS_PER_SECOND );
         filterFlushPublishTimerCounter = 0;
 
@@ -417,4 +422,74 @@
     return standbyState;
 }
 
+/*********************************************************************//**
+ * @brief
+ * The getFilterFlushTimePeriod function gets the filter flush time period.
+ * @details Inputs: filterFlushTimePeriod
+ * @details Outputs: none
+ * @return the current filter flush time period (in ms).
+ *************************************************************************/
+static U32 getFilterFlushTimePeriod( void )
+{
+    U32 result = filterFlushTimePeriod.data;
+
+    if ( OVERRIDE_KEY == filterFlushTimePeriod.override )
+    {
+        result = filterFlushTimePeriod.ovData;
+    }
+
+    return result;
+}
+
+
+/*************************************************************************
+ *                       TEST SUPPORT FUNCTIONS
+ *************************************************************************/
+
+
+/*********************************************************************//**
+ * @brief
+ * The testSetFilterFlushTimePeriodOverride function overrides the filter
+ * flush time period.
+ * @details Inputs: none
+ * @details Outputs: filterFlushTimePeriod
+ * @param value override concentrate pump data publish interval with (in ms)
+ * @return TRUE if override successful, FALSE if not
+ *************************************************************************/
+BOOL testSetFilterFlushTimePeriodOverride( U32 value )
+{
+    BOOL result = FALSE;
+
+    if ( TRUE == isTestingActivated() )
+    {
+        result = TRUE;
+        filterFlushTimePeriod.override = OVERRIDE_KEY;
+        filterFlushTimePeriod.ovData = value;
+    }
+
+    return result;
+}
+
+/*********************************************************************//**
+ * @brief
+ * The testResetFilterFlushTimePeriodOverride function resets the
+ * override of the filter flush time period.
+ * @details Inputs: none
+ * @details Outputs: filterFlushTimePeriod
+ * @return TRUE if override reset successful, FALSE if not
+ *************************************************************************/
+BOOL testResetFilterFlushTimePeriodOverride( void )
+{
+    BOOL result = FALSE;
+
+    if ( TRUE == isTestingActivated() )
+    {
+        result = TRUE;
+        filterFlushTimePeriod.override = OVERRIDE_RESET;
+        filterFlushTimePeriod.ovData = filterFlushTimePeriod.ovInitData;
+    }
+
+    return result;
+}
+
 /**@}*/
Index: firmware/App/Modes/ModeStandby.h
===================================================================
diff -u -r3eb7c2e62c727be195cd937d49957db9d4ba83b4 -r64f7d82ff6637d6fb179d31b0c1481d68ed99143
--- firmware/App/Modes/ModeStandby.h	(.../ModeStandby.h)	(revision 3eb7c2e62c727be195cd937d49957db9d4ba83b4)
+++ firmware/App/Modes/ModeStandby.h	(.../ModeStandby.h)	(revision 64f7d82ff6637d6fb179d31b0c1481d68ed99143)
@@ -37,15 +37,15 @@
 void transitionToStandbyMode( void );   // prepares for transition to standby mode
 U32  execStandbyMode( void );           // execute the standby mode state machine (call from OperationModes)
 
-DG_STANDBY_MODE_STATE_T getCurrentStandbyState( void );  // get the current state of the standby mode.
-
 void waterSampleCommandHandler( SAMPLE_WATER_CMD_T sampleWaterCmd );
 BOOL requestDGStart( void );            // HD requests DG start (go to re-circulate mode)
-
 BOOL startDGFlush( void );
-
 BOOL startDGHeatDisinfect( void );      // HD start heat disinfect mode
+DG_STANDBY_MODE_STATE_T getCurrentStandbyState( void );  // get the current state of the standby mode.
 
+BOOL testSetFilterFlushTimePeriodOverride( U32 value );
+BOOL testResetFilterFlushTimePeriodOverride( void );
+
 /**@}*/
 
 #endif
Index: firmware/App/Services/SystemComm.c
===================================================================
diff -u -r8467f8ff09e382e0991f14d02683080dc811e24e -r64f7d82ff6637d6fb179d31b0c1481d68ed99143
--- firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision 8467f8ff09e382e0991f14d02683080dc811e24e)
+++ firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision 64f7d82ff6637d6fb179d31b0c1481d68ed99143)
@@ -1254,6 +1254,10 @@
                 handleSetFluidLeakStateDetectorOverrideRequest( message );
                 break;
 
+            case MSG_ID_FILTER_FLUSH_TIME_PERIOD_OVERRIDE:
+                handleFilterFlushTimePeriodOverride(message);
+                break;
+
             default:
                 // TODO - unrecognized message ID received - ignore
                 break;
Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -ra8bb1da29825b5d666333629fda871652d16229a -r64f7d82ff6637d6fb179d31b0c1481d68ed99143
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision a8bb1da29825b5d666333629fda871652d16229a)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 64f7d82ff6637d6fb179d31b0c1481d68ed99143)
@@ -3083,4 +3083,36 @@
     sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, status );
 }
 
+/*********************************************************************//**
+ * @brief
+ * The handleFilterFlushTimePeriodOverride function handles a request
+ * to override the filter flush time period value.
+ * @details Inputs: none
+ * @details Outputs: message handled
+ * @param message a pointer to the message to handle
+ * @return none
+ *************************************************************************/
+void handleFilterFlushTimePeriodOverride( MESSAGE_T *message )
+{
+    TEST_OVERRIDE_PAYLOAD_T payload;
+    BOOL result = FALSE;
+
+    // verify payload length
+    if ( sizeof( TEST_OVERRIDE_PAYLOAD_T ) == message->hdr.payloadLen )
+    {
+        memcpy( &payload, message->payload, sizeof( TEST_OVERRIDE_PAYLOAD_T ) );
+        if ( FALSE == payload.reset )
+        {
+            result = testSetFilterFlushTimePeriodOverride( payload.state.u32 );
+        }
+        else
+        {
+            result = testResetFilterFlushTimePeriodOverride();
+        }
+    }
+
+    // respond to request
+    sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );
+}
+
 /**@}*/
Index: firmware/App/Services/SystemCommMessages.h
===================================================================
diff -u -r3eb7c2e62c727be195cd937d49957db9d4ba83b4 -r64f7d82ff6637d6fb179d31b0c1481d68ed99143
--- firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision 3eb7c2e62c727be195cd937d49957db9d4ba83b4)
+++ firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision 64f7d82ff6637d6fb179d31b0c1481d68ed99143)
@@ -335,6 +335,9 @@
 // MSG_ID_DG_SET_SCHEDULED_RUNS_RECORD
 void handleSetDGScheduledRunsRecord( MESSAGE_T *message );
 
+// MSG_ID_FILTER_FLUSH_TIME_PERIOD_OVERRIDE
+void handleFilterFlushTimePeriodOverride( MESSAGE_T *message );
+
 /**@}*/
 
 #endif