Index: firmware/App/Monitors/Level.h
===================================================================
diff -u -r3417933e6edf61a914c428e2fa944b3b349272a4 -r3678601eac45b69684724bb46fe913049985c410
--- firmware/App/Monitors/Level.h	(.../Level.h)	(revision 3417933e6edf61a914c428e2fa944b3b349272a4)
+++ firmware/App/Monitors/Level.h	(.../Level.h)	(revision 3678601eac45b69684724bb46fe913049985c410)
@@ -1,14 +1,14 @@
 /**************************************************************************
 *
-* Copyright (c) 2024-2025 Diality Inc. - All Rights Reserved.
+* Copyright (c) 2024-2026 Diality Inc. - All Rights Reserved.
 *
 * THIS CODE MAY NOT BE COPIED OR REPRODUCED IN ANY FORM, IN PART OR IN
 * WHOLE, WITHOUT THE EXPLICIT PERMISSION OF THE COPYRIGHT OWNER.
 *
 * @file    Level.h
 *
-* @author  (last)      Michael Garthwaite
-* @date    (last)      15-Sep-2025
+* @author  (last)      “rkallala”
+* @date    (last)      15-Jan-2026
 *
 * @author  (original)  Vinayakam Mani
 * @date    (original)  14-Oct-2024
@@ -37,7 +37,8 @@
 {
     D6_LEVL = 0,                        ///< floater switch low, medium and high status
     FIRST_DD_LEVL = D6_LEVL,            ///< First DD level
-    D63_LEVL,                           ///< bicarb level low or high status
+    D63_LEVL,                           ///< Bicarb upper level low or high status
+    D98_LEVL,                           ///< Bicarb lower level low or high status
     D46_LEVL,                           ///< Spent dialysate air separation chamber level low or high status
     LAST_DD_LEVL = D46_LEVL,            ///< Last DD level
     P25_LEVL,                           ///< FP level sensor
@@ -52,9 +53,10 @@
 /// floater and level sensor states.
 typedef enum level_States
 {
-    LEVEL_STATE_LOW = 0,                 ///< Low level
-    LEVEL_STATE_HIGH,                    ///< High level
+    LEVEL_STATE_EMPTY = 0,               ///< Empty level
+    LEVEL_STATE_LOW,                     ///< Low level
     LEVEL_STATE_MEDIUM,                  ///< Medium level
+    LEVEL_STATE_HIGH,                    ///< High level
     LEVEL_STATE_ILLEGAL,                 ///< Illegal level
     NUM_OF_LEVELS_STATES                 ///< Number of level states
 } LEVEL_STATE_T;
@@ -63,7 +65,9 @@
 typedef struct
 {
     U32 d6Level;                        ///< Floater level
-    U32 d63Level;                       ///< Bicarb level
+    U32 d63Level;                       ///< Bicarb upper level
+    U32 d98Level;                       ///< Bicarb lower level
+    U32 bicarbLevel;                    ///< Bicarb chamber level combination ( D63 + D98 )
     U32 d46Level;                       ///< Spent dialysate level
 } DD_LEVEL_DATA_T;
 
@@ -78,6 +82,7 @@
 void initLevels( void );
 void execLevels( void );
 LEVEL_STATE_T getLevelStatus( LEVEL_T levelId );
+LEVEL_STATE_T getBicarbChamberLevelStatus( void );
 
 BOOL testLevelsDataPublishIntervalOverride( MESSAGE_T *message );
 BOOL testLevelStatusOverride( MESSAGE_T *message );