Index: firmware/App/Services/Reservoirs.c
===================================================================
diff -u -r0035cfb9a3fa89a8f9c3e0b589a327ed9c1d9470 -r709def41bcde8e2e59d83c5e9c5a06ab0ee74ec8
--- firmware/App/Services/Reservoirs.c	(.../Reservoirs.c)	(revision 0035cfb9a3fa89a8f9c3e0b589a327ed9c1d9470)
+++ firmware/App/Services/Reservoirs.c	(.../Reservoirs.c)	(revision 709def41bcde8e2e59d83c5e9c5a06ab0ee74ec8)
@@ -7,8 +7,8 @@
 *
 * @file    Reservoirs.c
 *
-* @author  (last)      Dara Navaei
-* @date    (last)      07-Mar-2023
+* @author  (last)      Sean Nash
+* @date    (last)      16-Mar-2023
 *
 * @author  (original)  Dara Navaei
 * @date    (original)  21-Nov-2021
@@ -75,7 +75,9 @@
 static F32 dilutionLevelPct;                                                                             ///< Reservoir dilution level.
 static DG_OP_MODE_T dgOpMode;                                                                            ///< DG operation mode.
 static U32 dgSubMode;                                                                                    ///< DG operation submode.
-static U32 timeReservoirInUse;                                                                           ///< Reservoir time in use in milliseconds.
+static U32 timeReservoirInUse;                                                                           ///< Reservoir time in use in general task intervals.
+static U32 timeReservoirInUF;                                                                            ///< Reservoir time in ultrafiltration (in ms).
+static U32 lastTimeReservoirInUF;                                                                        ///< Reservoir time in ultrafiltration from prior reservoir (in ms).
 static F32 volSpentUFML;                                                                                 ///< Ultrafiltration volume in milliliters.
 static DG_RESERVOIR_ID_T activeReservoir;                                                                ///< Active reservoir.
 static F32 recirculationLevelPct;                                                                        ///< Recirculation level in percent.
@@ -129,6 +131,8 @@
     dgOpMode                    = DG_MODE_INIT;
     dgSubMode                   = 0;
     timeReservoirInUse          = 0;
+    timeReservoirInUF           = 0;
+    lastTimeReservoirInUF       = 0;
     volSpentUFML                = 0.0F;
     activeReservoir             = DG_RESERVOIR_1;
     recirculationLevelPct       = 0.0F;
@@ -181,12 +185,15 @@
     // Calculate volume used from active reservoir - do not accumulate if not performing dialysis or saline bolus is in progress
     if ( ( TREATMENT_DIALYSIS_STATE == getTreatmentState() ) && ( getDialysisState() != DIALYSIS_SALINE_BOLUS_STATE ) )
     {
-        volSpentML += ( flowRateMLPerMS * msSinceLastVolumeCalc );
-
-        if ( TREATMENT_DIALYSIS_STATE == getTreatmentState())
+#ifdef DIALYZER_REPRIME_ENABLED
+        if ( getDialysisState() != DIALYSIS_DIALYZER_REPRIME_STATE )
         {
-            ++timeReservoirInUse;
+#endif
+            volSpentML += ( flowRateMLPerMS * msSinceLastVolumeCalc );
+            timeReservoirInUse++;
+#ifdef DIALYZER_REPRIME_ENABLED
         }
+#endif
     }
 
     // Update the reservoir start time
@@ -241,6 +248,32 @@
     calculateActiveReservoirCycleTime();
 }
 
+/*********************************************************************//**
+ * @brief
+ * The getLastReservoirUFTimeInMs function returns the reservoir ultrafiltration
+ * time (in ms) for the last reservoir used in treatment.
+ * @details Inputs: none
+ * @details Outputs: none
+ * @return lastTimeReservoirInUF
+ *************************************************************************/
+U32 getLastReservoirUFTimeInMs( void )
+{
+    return lastTimeReservoirInUF;
+}
+
+/*********************************************************************//**
+ * @brief
+ * The updateReservoirUFTime function updates the reservoir ultrafiltration
+ * time (in ms) for currently active reservoir used in treatment.
+ * @details Inputs: timeReservoirInUF
+ * @details Outputs: timeReservoirInUF
+ * @return lastTimeReservoirInUF
+ *************************************************************************/
+void updateReservoirUFTime( void )
+{
+    timeReservoirInUF += TASK_GENERAL_INTERVAL;
+}
+
 // ********** private functions **********
 
 /*********************************************************************//**
@@ -658,6 +691,8 @@
         setFinalReservoirVolume();
 
         // Switched the active reservoir so reset the reservoir in use timer
+        lastTimeReservoirInUF = timeReservoirInUF;
+        timeReservoirInUF = 0;
         timeReservoirInUse = 0;
 
         // Reset to start state to restart drain, fill, switch process.