Index: sources/canbus/MessageDispatcher.cpp
===================================================================
diff -u -r4a7dd11138d2321f1ab8d324b3bd25f02eaefe84 -r48b04367d9f229104e4048783df91089d0106379
--- sources/canbus/MessageDispatcher.cpp	(.../MessageDispatcher.cpp)	(revision 4a7dd11138d2321f1ab8d324b3bd25f02eaefe84)
+++ sources/canbus/MessageDispatcher.cpp	(.../MessageDispatcher.cpp)	(revision 48b04367d9f229104e4048783df91089d0106379)
@@ -675,6 +675,7 @@
     mData += vData.mUFVolume                        ;
     mData += vData.mUFPreWeight                     ;
     mData += vData.mUFEstimatedTargetWeight         ;
+    mData += vData.mAcidConcentrateIndex            ;
 
     onActionTransmit(GuiActionType::ID_AdjustParametersValidationReq, mData);
 }
Index: sources/canbus/MessageGlobals.h
===================================================================
diff -u -r49def2e3814791586d0982eaca4bc8403997b640 -r48b04367d9f229104e4048783df91089d0106379
--- sources/canbus/MessageGlobals.h	(.../MessageGlobals.h)	(revision 49def2e3814791586d0982eaca4bc8403997b640)
+++ sources/canbus/MessageGlobals.h	(.../MessageGlobals.h)	(revision 48b04367d9f229104e4048783df91089d0106379)
@@ -221,8 +221,8 @@
     {Gui::GuiActionType::ID_AdjustInitTreatmentReq                  ,   1 * 4       }, // 1 parameters each 4bytes
     {Gui::GuiActionType::ID_AdjustInitTreatmentRsp                  ,   2 * 4       }, // 2 parameters each 4bytes
     // Pre-Treatment Treatment Parameters Validation/Confirm
-    {Gui::GuiActionType::ID_AdjustParametersValidationReq           ,  24 * 4       }, //23 parameters each 4bytes
-    {Gui::GuiActionType::ID_AdjustParametersValidationRsp           ,  25 * 4       }, //24 parameters each 4bytes
+    {Gui::GuiActionType::ID_AdjustParametersValidationReq           ,  25 * 4       }, //23 parameters each 4bytes
+    {Gui::GuiActionType::ID_AdjustParametersValidationRsp           ,  26 * 4       }, //24 parameters each 4bytes
     {Gui::GuiActionType::ID_AdjustParametersConfirmReq              ,   1 * 4       }, // 1 parameters each 4bytes
     // Pre-Treatment Water Sample
     {Gui::GuiActionType::ID_DGFilterFlushData                       ,   2 * 4       }, // 2 parameters each 4bytes
Index: sources/gui/qml/pages/pretreatment/create/PreTreatmentCreateContent.qml
===================================================================
diff -u -r5210cdb6a463cbf0ec4c794342b5bd46763b2823 -r48b04367d9f229104e4048783df91089d0106379
--- sources/gui/qml/pages/pretreatment/create/PreTreatmentCreateContent.qml	(.../PreTreatmentCreateContent.qml)	(revision 5210cdb6a463cbf0ec4c794342b5bd46763b2823)
+++ sources/gui/qml/pages/pretreatment/create/PreTreatmentCreateContent.qml	(.../PreTreatmentCreateContent.qml)	(revision 48b04367d9f229104e4048783df91089d0106379)
@@ -108,6 +108,7 @@
         vTreatmentCreate.ufVolumeRejectionReason                            = Variables.noRejectReason
         vTreatmentCreate.ufPreWeightRejectionReason                         = Variables.noRejectReason
         vTreatmentCreate.ufEstimatedTargetWeightRejectionReason             = Variables.noRejectReason
+        vTreatmentCreate.acidConcentrateIndexRejectionReason                = Variables.noRejectReason
     }
 
     function confirmReady () {
Index: sources/gui/qml/pages/pretreatment/create/PreTreatmentCreateTreatmentSettings.qml
===================================================================
diff -u -re50998d376110516b4d3c9c860b9cbb4f2013623 -r48b04367d9f229104e4048783df91089d0106379
--- sources/gui/qml/pages/pretreatment/create/PreTreatmentCreateTreatmentSettings.qml	(.../PreTreatmentCreateTreatmentSettings.qml)	(revision e50998d376110516b4d3c9c860b9cbb4f2013623)
+++ sources/gui/qml/pages/pretreatment/create/PreTreatmentCreateTreatmentSettings.qml	(.../PreTreatmentCreateTreatmentSettings.qml)	(revision 48b04367d9f229104e4048783df91089d0106379)
@@ -314,7 +314,7 @@
             text            : qsTr("Acid Concentrate")
 //            showEdit        : _root.editingEnabled // Hide 👋📋 TODO Phase 2
             onEditClicked   : _acidConcentrateAdjustment.open()
-            valid           : ! vTreatmentCreate.acidConcentrateConversionFactorRejectionReason
+            valid           : ! vTreatmentCreate.acidConcentrateConversionFactorRejectionReason && ! vTreatmentCreate.acidConcentrateIndexRejectionReason
 
             contentItem : BaseComboBox { id: _acidConcentrateComboBox
                 anchors.rightMargin : Variables.defaultMargin * 2
@@ -331,7 +331,8 @@
                 }
 
                 onActivated         : {
-                    if ( ! _acidConcentrate.valid ) { vTreatmentCreate.acidConcentrateConversionFactorRejectionReason = Variables.noRejectReason }
+                    if ( ! _acidConcentrate.valid ) {   vTreatmentCreate.acidConcentrateConversionFactorRejectionReason = Variables.noRejectReason
+                                                        vTreatmentCreate.acidConcentrateIndexRejectionReason            = Variables.noRejectReason }
                     vTreatmentCreate.acidConcentrate    = _acidConcentrateComboBox.currentIndex
                     vTreatmentCreate.acidConcentrateSet = true
                     vTreatmentCreate.acidConcentrateConversionFactor = vTreatmentRanges.acidConcentrateModel.get(vTreatmentCreate.acidConcentrate).value
Index: sources/model/hd/adjustment/pretreatment/MPreTreatmentAdjustParametersValidationResponse.h
===================================================================
diff -u -r4a7dd11138d2321f1ab8d324b3bd25f02eaefe84 -r48b04367d9f229104e4048783df91089d0106379
--- sources/model/hd/adjustment/pretreatment/MPreTreatmentAdjustParametersValidationResponse.h	(.../MPreTreatmentAdjustParametersValidationResponse.h)	(revision 4a7dd11138d2321f1ab8d324b3bd25f02eaefe84)
+++ sources/model/hd/adjustment/pretreatment/MPreTreatmentAdjustParametersValidationResponse.h	(.../MPreTreatmentAdjustParametersValidationResponse.h)	(revision 48b04367d9f229104e4048783df91089d0106379)
@@ -58,8 +58,9 @@
  * | #21:(U32) | \ref Data::mDialysateTempRejectionReason                   |
  * | #22:(U32) | \ref Data::mAcidConcentrateConversionFactorRejectionReason |
  * | #23:(U32) | \ref Data::mUFVolumeRejectionReason                        |
- * | #23:(U32) | \ref Data::mUFPreWeightRejectionReason                     |
- * | #23:(U32) | \ref Data::mUFEstimatedTargetWeightRejectionReason         |
+ * | #24:(U32) | \ref Data::mUFPreWeightRejectionReason                     |
+ * | #25:(U32) | \ref Data::mUFEstimatedTargetWeightRejectionReason         |
+ * | #26:(U32) | \ref Data::mAcidConcentrateIndexRejectionReason            |
  *
  * \sa Data
  *
@@ -103,6 +104,7 @@
         Types::U32 mUFVolumeRejectionReason                         ;
         Types::U32 mUFPreWeightRejectionReason                      ;
         Types::U32 mUFEstimatedTargetWeightRejectionReason          ;
+        Types::U32 mAcidConcentrateIndexRejectionReason             ;
     } _data;
 
 public:
@@ -137,6 +139,7 @@
         quint32 mUFVolumeRejectionReason                        = 0;
         quint32 mUFPreWeightRejectionReason                     = 0;
         quint32 mUFEstimatedTargetWeightRejectionReason         = 0;
+        quint32 mAcidConcentrateIndexRejectionReason            = 0;
     };
 
     MAdjustParametersValidationResponse () {}
Index: sources/model/hd/adjustment/pretreatment/MPreTreatmentAdjustRequests.h
===================================================================
diff -u -r1132f049e169cc87a059261f72fca0ceb7d739f1 -r48b04367d9f229104e4048783df91089d0106379
--- sources/model/hd/adjustment/pretreatment/MPreTreatmentAdjustRequests.h	(.../MPreTreatmentAdjustRequests.h)	(revision 1132f049e169cc87a059261f72fca0ceb7d739f1)
+++ sources/model/hd/adjustment/pretreatment/MPreTreatmentAdjustRequests.h	(.../MPreTreatmentAdjustRequests.h)	(revision 48b04367d9f229104e4048783df91089d0106379)
@@ -96,7 +96,7 @@
  * | #22:(F32) | \ref mUFVolume                             |
  * | #23:(F32) | \ref mUFPreWeight                          |
  * | #24:(F32) | \ref mUFEstimatedTargetWeight              |
-
+ * | #25:(U32) | \ref mAcidConcentrateIndex                 |
  *
  */
 class MAdjustParametersValidationReq : public MModel {
@@ -125,6 +125,7 @@
     float   mUFVolume                           = 0; // L
     float   mUFPreWeight                        = 0; // kg
     float   mUFEstimatedTargetWeight            = 0; // kg
+    quint32 mAcidConcentrateIndex               = 0; // <options>
 
     QString toString() {
         return toString({
@@ -152,6 +153,7 @@
             mUFVolume                       ,
             mUFPreWeight                    ,
             mUFEstimatedTargetWeight        ,
+            mAcidConcentrateIndex           ,
         });
     }
     static QString toString(const QVariantList &vParameters) {
Index: sources/view/VTreatmentCreate.cpp
===================================================================
diff -u -r4a7dd11138d2321f1ab8d324b3bd25f02eaefe84 -r48b04367d9f229104e4048783df91089d0106379
--- sources/view/VTreatmentCreate.cpp	(.../VTreatmentCreate.cpp)	(revision 4a7dd11138d2321f1ab8d324b3bd25f02eaefe84)
+++ sources/view/VTreatmentCreate.cpp	(.../VTreatmentCreate.cpp)	(revision 48b04367d9f229104e4048783df91089d0106379)
@@ -66,6 +66,7 @@
     data.mUFVolume                          = _ultrafiltrationVolume            ;
     data.mUFPreWeight                       = _ufPreWeight                      ;
     data.mUFEstimatedTargetWeight           = _ufEstimatedTargetWeight          ;
+    data.mAcidConcentrateIndex              = _acidConcentrate                  ;
 
     parametersConfirmed(false);
     parametersValidated(false);
@@ -143,6 +144,7 @@
         ufVolumeRejectionReason                         (data.mUFVolumeRejectionReason                          );
         ufPreWeightRejectionReason                      (data.mUFPreWeightRejectionReason                       );
         ufEstimatedTargetWeightRejectionReason          (data.mUFEstimatedTargetWeightRejectionReason           );
+        acidConcentrateIndexRejectionReason             (data.mAcidConcentrateIndexRejectionReason              );
 
         parametersValidated(false);
     }
Index: sources/view/VTreatmentCreate.h
===================================================================
diff -u -r1132f049e169cc87a059261f72fca0ceb7d739f1 -r48b04367d9f229104e4048783df91089d0106379
--- sources/view/VTreatmentCreate.h	(.../VTreatmentCreate.h)	(revision 1132f049e169cc87a059261f72fca0ceb7d739f1)
+++ sources/view/VTreatmentCreate.h	(.../VTreatmentCreate.h)	(revision 48b04367d9f229104e4048783df91089d0106379)
@@ -138,6 +138,7 @@
     TRIGGER(quint32     , ufVolumeRejectionReason                           , 0)
     TRIGGER(quint32     , ufPreWeightRejectionReason                        , 0)
     TRIGGER(quint32     , ufEstimatedTargetWeightRejectionReason            , 0)
+    TRIGGER(quint32     , acidConcentrateIndexRejectionReason               , 0)
 
     VIEW_DEC_CLASS(VTreatmentCreate)
     VIEW_DEC_SLOT(AdjustParametersValidationResponseData)