Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -rfa356a2bce909141f45c6832659fa1ceea5bfbba -r49dba1e95bb3763b4c150e7a80b84a65264a7ca8
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision fa356a2bce909141f45c6832659fa1ceea5bfbba)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 49dba1e95bb3763b4c150e7a80b84a65264a7ca8)
@@ -1998,6 +1998,119 @@
     result = serializeMessage( msg, COMM_BUFFER_OUT_CAN_HD_2_UI, ACK_REQUIRED );
 
     return result;
+}
+
+/*********************************************************************//**
+ * @brief
+ * The handlRinsebackCmd function handles a rinseback user action command
+ * message from the UI.
+ * @details Inputs: none
+ * @details Outputs: message handled
+ * @param message a pointer to the message to handle
+ * @return none
+ *************************************************************************/
+void handlRinsebackCmd( MESSAGE_T *message )
+{
+    if ( sizeof(U32) == message->hdr.payloadLen )
+    {
+        U32 cmd;
+
+        memcpy( &cmd, &message->payload[0], sizeof(U32) );
+
+        signalRinsebackUserAction( (REQUESTED_RINSEBACK_USER_ACTIONS_T)cmd );
+    }
+    else
+    {
+        sendAckResponseMsg( (MSG_ID_T)message->hdr.msgID, COMM_BUFFER_OUT_CAN_HD_2_UI, FALSE );
+    }
+}
+
+/*********************************************************************//**
+ * @brief
+ * The sendRinsebackCmdResponse function constructs a rinseback user action
+ * response to the UI and queues the msg for transmit on the appropriate CAN channel.
+ * @details Inputs: none
+ * @details Outputs: Rinseback command response msg constructed and queued.
+ * @param accepted T/F - was rinseback user action accepted?
+ * @param rejReason reason why action was rejected (or zero if accepted)
+ * @return TRUE if msg successfully queued for transmit, FALSE if not
+ *************************************************************************/
+BOOL sendRinsebackCmdResponse( BOOL accepted, U32 rejReason )
+{
+    BOOL result;
+    MESSAGE_T msg;
+    U08 *payloadPtr = msg.payload;
+
+    // Create a message record
+    blankMessage( &msg );
+    msg.hdr.msgID = MSG_ID_HD_RINSEBACK_CMD_RESPONSE;
+    msg.hdr.payloadLen = sizeof( BOOL ) + sizeof( U32 );
+
+    memcpy( payloadPtr, &accepted, sizeof( BOOL ) );
+    payloadPtr += sizeof( BOOL );
+    memcpy( payloadPtr, &rejReason, 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_HD_2_UI, ACK_REQUIRED );
+
+    return result;
+}
+
+/*********************************************************************//**
+ * @brief
+ * The handleTreatmentRecircCmd function handles a treatment re-circ user action command
+ * message from the UI.
+ * @details Inputs: none
+ * @details Outputs: message handled
+ * @param message a pointer to the message to handle
+ * @return none
+ *************************************************************************/
+void handleTreatmentRecircCmd( MESSAGE_T *message )
+{
+    if ( sizeof(U32) == message->hdr.payloadLen )
+    {
+        U32 cmd;
+
+        memcpy( &cmd, &message->payload[0], sizeof(U32) );
+
+        signalTreatmentRecircUserAction( (REQUESTED_TREATMENT_RECIRC_USER_ACTIONS_T)cmd );
+    }
+    else
+    {
+        sendAckResponseMsg( (MSG_ID_T)message->hdr.msgID, COMM_BUFFER_OUT_CAN_HD_2_UI, FALSE );
+    }
+}
+
+/*********************************************************************//**
+ * @brief
+ * The sendTreatmentRecircCmdResponse function constructs a treatment re-circulation
+ * user action response to the UI and queues the msg for transmit on the appropriate
+ * CAN channel.
+ * @details Inputs: none
+ * @details Outputs: Treatment re-circ command response msg constructed and queued.
+ * @param accepted T/F - was re-circ user action accepted?
+ * @param rejReason reason why action was rejected (or zero if accepted)
+ * @return TRUE if msg successfully queued for transmit, FALSE if not
+ *************************************************************************/
+BOOL sendTreatmentRecircCmdResponse( BOOL accepted, U32 rejReason )
+{
+    BOOL result;
+    MESSAGE_T msg;
+    U08 *payloadPtr = msg.payload;
+
+    // Create a message record
+    blankMessage( &msg );
+    msg.hdr.msgID = MSG_ID_HD_RECIRC_CMD_RESPONSE;
+    msg.hdr.payloadLen = sizeof( BOOL ) + sizeof( U32 );
+
+    memcpy( payloadPtr, &accepted, sizeof( BOOL ) );
+    payloadPtr += sizeof( BOOL );
+    memcpy( payloadPtr, &rejReason, 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_HD_2_UI, ACK_REQUIRED );
+
+    return result;
 }
 
 /*********************************************************************//**