Index: firmware/App/Controllers/DryBiCart.c
===================================================================
diff -u -rb6eae874da9199ab986e698bdfb750cf949863f1 -rd2052e3666249367e2c7e4d2060b45b4fffd469c
--- firmware/App/Controllers/DryBiCart.c	(.../DryBiCart.c)	(revision b6eae874da9199ab986e698bdfb750cf949863f1)
+++ firmware/App/Controllers/DryBiCart.c	(.../DryBiCart.c)	(revision d2052e3666249367e2c7e4d2060b45b4fffd469c)
@@ -56,7 +56,7 @@
 #define DRY_BICART_FILL_INITIATE_PRESSURE           1.5F                                        ///< Minimum pressure required to initiate the dry bicart fill process.
 #define DRY_BICART_FILL_COMPLETE_SUPPLY_PRESSURE    6.0F                                        ///< Maximum pressure allowed at bicart fill during supply process/state
 #define DRY_BICART_FILL_INITIATE_SUPPLY_PRESSURE    3.0F                                        ///< Minimum pressure required to initiate the dry bicart fill during supply process/state
-#define MAX_DRY_BICART_FILL_COMPLETE_PRESSURE       15
+#define MAX_DRY_BICART_FILL_COMPLETE_PRESSURE       15                                          ///< Very Max dry bicart fill complete pressure for persistence on d66
 
 #define DRY_BICART_DEFAULT_MAX_FILL_CYCLE_CNT       10                                          ///< Default max fill cycle allowed for dry bicart fill/mix with water.
 #define DRY_BICART_MAX_FILL_CYCLE_CNT               30                                          ///< Max fill cycle allowed (by override) for dry bicart fill/mix with water.
@@ -80,7 +80,7 @@
 #define DRY_BICART_DRAIN_COND_STABLE_SAMPLES        10U                                         ///< Debounce samples (10*50ms=500ms)
 
 // drybicarb mixing
-#define BICARB_VOL_CONTROL_P_COEFFICIENT            ( 0.00008484 * 2 )                           ///< Bicarb proportional gain (kp)
+#define BICARB_VOL_CONTROL_P_COEFFICIENT            ( 0.00008484 * 2 )                          ///< Bicarb proportional gain (kp)
 #define BICARB_VOL_CONTROL_I_COEFFICIENT            ( 0.00033936 / 5)                           ///< Bicarb integral gain. (ki)
 #define MIN_BICARB_VOLUME_ML                        0.868686869                                 ///< Minimum bicarb volume in mL
 #define MAX_BICARB_VOLUME_ML                        1.8                                         ///< Maximum bicarb volume in mL
@@ -187,6 +187,7 @@
 static U32 dryBiCartDrainCondStableCount;                                                       ///< Debounce counter for "zero" conductivity
 static U32 dryBiCartDrainTimePeriod;                                                            ///< Dry bicart drain time period
 
+static U32 dryBiCartPersistanceStartTime;                                                       ///< Dry bicart fill start time.
 static DRY_BICART_OPERATION_T dryBicartStartRequest;                                            ///< Dry bicart operation, fill or supply or drain request
 
 // drybicart mixing
@@ -390,6 +391,7 @@
     dryBiCartDrainLastCondSampleTime                    = 0;
     dryBiCartDrainCondStableCount                       = 0;
     dryBiCartDrainTimePeriod                            = 0;
+    dryBiCartPersistanceStartTime                       = 0;
 
     initializePIController( PI_CONTROLLER_ID_BICARB_VOL, 0.0F,\
                            getBicarbKpGainCoefficient(), getBicarbKiGainCoefficient(),\
@@ -1251,6 +1253,11 @@
     // Close dry bicart inlet water if bicart is filled with water
     if ( d66Pressure >= DRY_BICART_FILL_COMPLETE_PRESSURE )
     {
+        // start the persistance timer once d66 reaches 11 PSI
+        if ( 0 == dryBiCartPersistanceStartTime )
+        {
+            dryBiCartPersistanceStartTime = getMSTimerCount();
+        }
         // to check the the maximum cart pressure during persistence on D66
         if ( d66Pressure >= MAX_DRY_BICART_FILL_COMPLETE_PRESSURE )
         {
@@ -1264,7 +1271,7 @@
             state = DRY_BICART_DEGAS_START_STATE;
         }
         // 200 ms persistence on D66 pressure since pressure overshoot just after D65 opening
-        if ( TRUE == didTimeout( dryBiCartFillStartTime, DRY_BICART_FILL_PERSISTANCE_DURATION_MS ) )
+        if ( TRUE == didTimeout( dryBiCartPersistanceStartTime, DRY_BICART_FILL_PERSISTANCE_DURATION_MS ) )
         {
             setValveState( D65_VALV, VALVE_STATE_CLOSED );