Index: firmware/App/Services/DDInterface.c
===================================================================
diff -u -r3ad3d957a31c79b3ff1e0da924627185d56fa642 -rb5bdf7651e9adbcd91a28fe13ccb70c02b339c90
--- firmware/App/Services/DDInterface.c	(.../DDInterface.c)	(revision 3ad3d957a31c79b3ff1e0da924627185d56fa642)
+++ firmware/App/Services/DDInterface.c	(.../DDInterface.c)	(revision b5bdf7651e9adbcd91a28fe13ccb70c02b339c90)
@@ -7,8 +7,8 @@
 *
 * @file    DDInterface.c
 *
-* @author  (last)      suresh
-* @date    (last)      17-Aug-2026
+* @author  (last)      Vijay Pamula
+* @date    (last)      19-Aug-2026
 *
 * @author  (original)  Sean Nash
 * @date    (original)  01-Aug-2024
@@ -108,14 +108,6 @@
     ddStarted                                 = FALSE;
     ddStartCommandSent                        = FALSE;
 
-    preGenDialysateCmdSet.start               = FALSE;
-    preGenDialysateCmdSet.dialRate            = 0.0F;
-    preGenDialysateCmdSet.dialTemp            = 0.0F;
-    preGenDialysateCmdSet.acidConvFactor      = 0.0F;
-    preGenDialysateCmdSet.bicarbConvFactor    = 0.0F;
-    preGenDialysateCmdSet.sodium              = 0;
-    preGenDialysateCmdSet.bicarbonate         = 0;
-
     dialysateDeliveryCmdSet.start             = FALSE;
     dialysateDeliveryCmdSet.dialRate          = 0.0F;
     dialysateDeliveryCmdSet.ufRate            = 0.0F;
@@ -126,10 +118,8 @@
     dialysateDeliveryCmdSet.sodium            = 0;
     dialysateDeliveryCmdSet.bicarbonate       = 0;
     dialysateDeliveryCmdSet.substitutionRate  = 0.0F;
-
     primeDataCmdSet.chamberHValveOpen         = FALSE;
     primeDataCmdSet.primeFluidDiscardStart    = FALSE;
-    //dialysateDeliveryCmdSet.substitutionRate  = 0.0F;
 }
 
 /**********************************************************************//**
@@ -468,7 +458,7 @@
     dialysateDeliveryCmdSet.bicarbConvFactor = bicarbConvFactor;
     dialysateDeliveryCmdSet.sodium           = sodium;
     dialysateDeliveryCmdSet.bicarbonate      = bicarbonate;
-    //dialysateDeliveryCmdSet.substitutionRate = 0.0F;
+    dialysateDeliveryCmdSet.substitutionRate = 0.0F;
 
 #ifndef TEST_UI_ONLY
     sendMessage( MSG_ID_DD_GEN_DIALYSATE_REQUEST_DATA, COMM_BUFFER_OUT_CAN_TD_2_DD, (U08*)(&dialysateDeliveryCmdSet), sizeof( DIALYSATE_DELIVERY_REQ_PAYLOAD_T ) );
@@ -711,7 +701,7 @@
 {
     if ( TRUE == dialysateDeliveryCmdSet.start )
     {
-        //dialysateDeliveryCmdSet.substitutionRate = qs;
+        dialysateDeliveryCmdSet.substitutionRate = qs;
 #ifndef TEST_UI_ONLY
         sendMessage( MSG_ID_DD_GEN_DIALYSATE_REQUEST_DATA, COMM_BUFFER_OUT_CAN_TD_2_DD,
                      (U08*)(&dialysateDeliveryCmdSet), sizeof( DIALYSATE_DELIVERY_REQ_PAYLOAD_T ) );