Index: leahi_dialin/dd/modules/spent_chamber_fill.py
===================================================================
diff -u -r20c821bd230fc7689a0275a2918981669ff5cc19 -r6d104d3185ac3ed7c18c97ecdc13fd59bf53a8d1
--- leahi_dialin/dd/modules/spent_chamber_fill.py	(.../spent_chamber_fill.py)	(revision 20c821bd230fc7689a0275a2918981669ff5cc19)
+++ leahi_dialin/dd/modules/spent_chamber_fill.py	(.../spent_chamber_fill.py)	(revision 6d104d3185ac3ed7c18c97ecdc13fd59bf53a8d1)
@@ -8,20 +8,23 @@
 # @file    spent_chamber_fill.py
 #
 # @author  (last)      Zoltan Miskolci
-# @date    (last)      07-Jan-2026
+# @date    (last)      04-May-2026
 # @author  (original)  Jonny Paguio
 # @date    (original)  26-Aug-2025
 #
 ############################################################################
 
-import struct
+# Module imports
 from logging import Logger
 
+# Project imports
 from leahi_dialin.common.constants import NO_RESET
+from leahi_dialin.common.generic_defs import DataTypes
 from leahi_dialin.common.msg_defs import MsgIds, MsgFieldPositions
 from leahi_dialin.common.override_templates import cmd_generic_broadcast_interval_override
-from leahi_dialin.protocols.CAN import DenaliChannels
-from leahi_dialin.utils.base import AbstractSubSystem, publish
+from leahi_dialin.protocols.CAN import DenaliCanMessenger, DenaliChannels
+from leahi_dialin.utils.abstract_classes import AbstractSubSystem
+from leahi_dialin.utils.base import publish
 
 
 class DDSpentChamberFill(AbstractSubSystem):
@@ -30,7 +33,7 @@
 
     Dialysate Delivery (DD) Dialin API sub-class for Spent Chamber Fill related commands.
     """
-    def __init__(self, can_interface, logger: Logger):
+    def __init__(self, can_interface: DenaliCanMessenger, logger: Logger):
         """
 
         @param can_interface: Denali Can Messenger object
@@ -41,10 +44,9 @@
         self.logger = logger
 
         if self.can_interface is not None:
-            channel_id = DenaliChannels.dd_sync_broadcast_ch_id
-            self.msg_id_dd_spent_chamber_fill_data = MsgIds.MSG_ID_DD_SPENT_CHAMBER_FILL_DATA.value
-            self.can_interface.register_receiving_publication_function(channel_id, self.msg_id_dd_spent_chamber_fill_data,
-                                                                       self._handler_spent_chamber_fill_sync)
+            self.can_interface.register_receiving_publication_function(channel_id = DenaliChannels.dd_sync_broadcast_ch_id,
+                                                                       message_id = MsgIds.MSG_ID_DD_SPENT_CHAMBER_FILL_DATA.value,
+                                                                       function = self._handler_spent_chamber_fill_sync)
 
         self.dd_spent_chamber_timestamp = 0                     #: The timestamp of the latest message
         self.execution_state = 0                                #: The execution state
@@ -63,13 +65,14 @@
         @param message:  published spent chamber fill data message
         @return: None
         """
-        self.execution_state = struct.unpack('I', bytearray(
-            message['message'][MsgFieldPositions.START_POS_FIELD_1:MsgFieldPositions.END_POS_FIELD_1]))[0]
-        self.switching_period = struct.unpack('I', bytearray(
-            message['message'][MsgFieldPositions.START_POS_FIELD_2:MsgFieldPositions.END_POS_FIELD_2]))[0]
-        self.total_spent_chamber_fill_counter = struct.unpack('I', bytearray(
-            message['message'][MsgFieldPositions.START_POS_FIELD_3:MsgFieldPositions.END_POS_FIELD_3]))[0]
+        msg_list =[]
+        msg_list.append(('self.execution_state',                    DataTypes.U32))
+        msg_list.append(('self.switching_period',                   DataTypes.U32))
+        msg_list.append(('self.total_spent_chamber_fill_counter',   DataTypes.U32))
 
+        self.process_into_vars(decoder_list = msg_list,
+                               message = message)
+
         self.dd_spent_chamber_timestamp = timestamp