Index: firmware/App/Modes/ModeStandby.c
===================================================================
diff -u -rb631516f8159c25ba2ffd215afa696795d97a28c -r5fa15db8e36792f83650711ab29755912d229437
--- firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision b631516f8159c25ba2ffd215afa696795d97a28c)
+++ firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision 5fa15db8e36792f83650711ab29755912d229437)
@@ -25,6 +25,7 @@
 #include "ROPump.h"
 #include "SystemComm.h"
 #include "SystemCommMessages.h"
+#include "TaskGeneral.h"
 #include "Timers.h"
 #include "Valves.h"
 
@@ -35,9 +36,10 @@
 
 // ********** private definitions **********
 
-#define FILTER_FLUSH_TIME_MS            ( 120 * MS_PER_SECOND )                 ///< Duration of filter flush state (in ms).
-#define WATER_SAMPLE_TIME_MS            ( 10 * MS_PER_SECOND )                  ///< Duration of water sample state (in ms).
-#define FLUSH_EXPIRATION_TIME_MS        ( 10 * SEC_PER_MIN * MS_PER_SECOND )    ///< Duration in which a filter flush is valid (in ms).
+#define FILTER_FLUSH_TIME_MS                ( 120 * MS_PER_SECOND )                     ///< Duration of filter flush state (in ms).
+#define WATER_SAMPLE_TIME_MS                ( 10 * MS_PER_SECOND )                      ///< Duration of water sample state (in ms).
+#define FLUSH_EXPIRATION_TIME_MS            ( 10 * SEC_PER_MIN * MS_PER_SECOND )        ///< Duration in which a filter flush is valid (in ms).
+#define FILTER_FLUSH_DATA_PUBLISH_INTERVAL  ( MS_PER_SECOND / TASK_GENERAL_INTERVAL )   ///< Filter flush data broadcast interval.
 
 // ********** private data **********
 
@@ -50,6 +52,7 @@
 static BOOL pendingStartDGRequest = FALSE;                                  ///< Flag indicating HD has requested DG start (go to re-circulate mode).
 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.
 
 // ********** private function prototypes **********
 
@@ -75,6 +78,7 @@
 
     waterSampleStartTime = 0;
     filterFlushStartTime = 0;
+    filterFlushPublishTimerCounter = 0;
     pendingStartDGRequest = FALSE;
 }
 
@@ -201,6 +205,15 @@
         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 countdown = ( ( getMSTimerCount() - filterFlushStartTime ) / MS_PER_SECOND );
+        filterFlushPublishTimerCounter = 0;
+
+        broadcastFilterFlushData( timeout, countdown );
+    }
+
     return state;
 }
 
Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -rb631516f8159c25ba2ffd215afa696795d97a28c -r5fa15db8e36792f83650711ab29755912d229437
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision b631516f8159c25ba2ffd215afa696795d97a28c)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 5fa15db8e36792f83650711ab29755912d229437)
@@ -884,6 +884,36 @@
 
 /*********************************************************************//**
  * @brief
+ * The broadcastFilterFlushData function sends out the filter flush progress data.
+ * @details Inputs: none
+ * @details Outputs: filter flush data msg constructed and queued
+ * @param timeout flush filter timeout (in sec)
+ * @param countdown flush filter timeout count down (in sec)
+ * @return TRUE if msg successfully queued for transmit, FALSE if not
+ *************************************************************************/
+BOOL broadcastFilterFlushData( U32 timeout, U32 countdown )
+{
+    BOOL result;
+    MESSAGE_T msg;
+    U08 *payloadPtr = msg.payload;
+
+    // create a message record
+    blankMessage( &msg );
+    msg.hdr.msgID = MSG_ID_DG_FILTER_FLUSH_PROGRESS;
+    msg.hdr.payloadLen = sizeof( U32 ) + sizeof( U32 );
+
+    memcpy( payloadPtr, &timeout, sizeof( U32 ) );
+    payloadPtr += sizeof( U32 );
+    memcpy( payloadPtr, &countdown, sizeof( U32 ) );
+
+    // serialize the message (w/ sync, CRC, and appropriate CAN padding) and add serialized message data to appropriate comm buffer
+    result = serializeMessage( msg, COMM_BUFFER_OUT_CAN_DG_BROADCAST, ACK_NOT_REQUIRED );
+
+    return result;
+}
+
+/*********************************************************************//**
+ * @brief
  * The sendCommandResponseMsg function constructs a command response to HD
  * and queues the msg for transmit on the appropriate CAN channel.
  * @details Inputs: none
Index: firmware/App/Services/SystemCommMessages.h
===================================================================
diff -u -r6145c5d1a645646587fb077df3c61eef2354f744 -r5fa15db8e36792f83650711ab29755912d229437
--- firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision 6145c5d1a645646587fb077df3c61eef2354f744)
+++ firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision 5fa15db8e36792f83650711ab29755912d229437)
@@ -99,6 +99,9 @@
 // MSG_ID_DG_UV_REACTORS_DATA
 BOOL broadcastUVReactorsData( UV_REACTORS_DATA_T *uvReactorsData );
 
+// MSG_ID_DG_FILTER_FLUSH_PROGRESS
+BOOL broadcastFilterFlushData( U32 timeout, U32 countdown );
+
 // MSG_ID_DG_COMMAND_RESPONSE
 void sendCommandResponseMsg( DG_CMD_RESPONSE_T *cmdResponsePtr );