Index: firmware/App/Controllers/SubstitutionPump.h
===================================================================
diff -u -r84b30e2da7c4374d06ef068d3cb2b5c0c4fabccd -rf90c1eef73251d75ce49645eb05deb492a486ff0
--- firmware/App/Controllers/SubstitutionPump.h	(.../SubstitutionPump.h)	(revision 84b30e2da7c4374d06ef068d3cb2b5c0c4fabccd)
+++ firmware/App/Controllers/SubstitutionPump.h	(.../SubstitutionPump.h)	(revision f90c1eef73251d75ce49645eb05deb492a486ff0)
@@ -10,8 +10,8 @@
 * @author  (last)      Sameer Kalliadan Poyil
 * @date    (last)      15-Apr-2026
 *
-* @author  (original)  Vinayakam Mani
-* @date    (original)  19-Sep-2024
+* @author  (original)  Michael Garthwaite
+* @date    (original)  5-May-2026
 *
 ***************************************************************************/
 
@@ -31,7 +31,7 @@
 
 // ********** public definitions **********
 
-#define SUB_PUMP_CONT_VOLUME                      0xFFFFFFFF          ///< Volume set to 0xFFFFFFFF enables continuous delivery based on the speed set.
+#define SUB_PUMP_CONT_VOLUME                    0xFFFFFFFF          ///< Volume set to 0xFFFFFFFF enables continuous delivery based on the speed set.
 
 #define PARK_CONC_PUMPS                         TRUE                ///< For park parameter to requestConcentratePumpOff().
 #define NO_PARK_CONC_PUMPS                      FALSE               ///< For park parameter to requestConcentratePumpOff().
@@ -47,10 +47,9 @@
 /// Substitution pump data struct.
 typedef struct
 {
-    F32 d92_PumpTargetSpeed;                                         ///< substitution pump D92_Pump target speed
-    F32 d92_PumpCurrentSetSpeed;                                     ///< substitution pump D92_Pump current set speed
-    U32 d92_PumpTargetRevCount;                                      ///< substitution pump D92_Pump target revolution count
-    U32 d92_PumpState;                                               ///< substitution pump D92_Pump current state
+    F32 d92_PumpTargetSpeed;                                         ///< Substitution pump D92_Pump target speed
+    F32 d92_PumpCurrentSetSpeed;                                     ///< Substitution pump D92_Pump current set speed
+    U32 d92_PumpState;                                               ///< Substitution pump D92_Pump current state
 } SUBSTITUTION_PUMP_DATA_T;
 
 // ********** public function prototypes **********
@@ -62,12 +61,12 @@
 void requestSubstitutionPumpOn( SUBSTITUTION_PUMPS_T pumpId );
 void requestSubstitutionPumpOff( SUBSTITUTION_PUMPS_T pumpId );
 F32 getSubstitutionPumpTargetSpeed( SUBSTITUTION_PUMPS_T pumpId );
+void setSubstitutionPumpTargetSpeed( SUBSTITUTION_PUMPS_T pumpId, F32 targetSpeed_ml_min );
 
 BOOL testSubstitutionPumpDataPublishIntervalOverride( MESSAGE_T *message );
 BOOL testSubstitutionPumpTargetSpeedOverride( MESSAGE_T *message );
 
-BOOL testSubstitutionPumpStartStopOverride( MESSAGE_T *message );      // Concentrate pump start/stop request
-
+BOOL testSubstitutionPumpStartStopOverride( MESSAGE_T *message );
 /**@}*/
 
 #endif