Index: leahi_dialin/dd/modules/concentrate_pump.py
===================================================================
diff -u -recd89ae316cd2afa695dd4e93ac18b6004975efb -r03936b9327b52b7ea33aecb5aa2129f33583bc35
--- leahi_dialin/dd/modules/concentrate_pump.py	(.../concentrate_pump.py)	(revision ecd89ae316cd2afa695dd4e93ac18b6004975efb)
+++ leahi_dialin/dd/modules/concentrate_pump.py	(.../concentrate_pump.py)	(revision 03936b9327b52b7ea33aecb5aa2129f33583bc35)
@@ -346,3 +346,35 @@
             return False
 
 
+    def cmd_concentrate_set_start_stop(self, pump_id: int, command: int, speed: float ) -> int:
+        """
+        Constructs and sends the concentrate pump start stop command
+
+        @param pump_id: unsigned int - concentrate pump ID
+        @param command:  int - value to command the concentrate pump
+        @param speed:  float - ml/min to set the speed to
+        @return: 1 if successful, zero otherwise
+
+        """
+
+        pmp = integer_to_bytearray(pump_id)
+        cmd = integer_to_bytearray(command)
+        spd = float_to_bytearray(speed)
+        payload = pmp + cmd + spd
+
+        message = DenaliMessage.build_message(channel_id=DenaliChannels.dialin_to_dd_ch_id,
+                                              message_id=MsgIds.MSG_ID_DD_CONCENTRATE_PUMPS_START_STOP_OVERRIDE_REQUEST.value,
+                                              payload=payload)
+
+        self.logger.debug("setting " + str(spd) + " - for pump: " + str(pump_id))
+
+        # Send message
+        received_message = self.can_interface.send(message)
+
+        # If there is content...
+        if received_message is not None:
+            # response payload is OK or not OK
+            return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
+        else:
+            self.logger.error("Timeout!!!!")
+            return False
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