Index: sources/gui/qml/dialogs/AcidConcentrateAdjustment.qml
===================================================================
diff -u -r40b1d61161d8a6d918d54de0c82923458f901d9b -r53ec19e12772f2a73190323438106dc93e4a12df
--- sources/gui/qml/dialogs/AcidConcentrateAdjustment.qml	(.../AcidConcentrateAdjustment.qml)	(revision 40b1d61161d8a6d918d54de0c82923458f901d9b)
+++ sources/gui/qml/dialogs/AcidConcentrateAdjustment.qml	(.../AcidConcentrateAdjustment.qml)	(revision 53ec19e12772f2a73190323438106dc93e4a12df)
@@ -26,8 +26,8 @@
 ModalDialog { id : _root
     property int controlWidth   : 770
     property int controlHeight  : 86
-    readonly property string adjustment: ("%1 K, %2 Ca, 1 Mg") .arg(_potassiumVolumeControl.value.toFixed(1))
-                                                               .arg(_calciumVolumeControl.value.toFixed(1))
+    readonly property string adjustment: ("%1 K, %2 Ca, 1 Mg") .arg(_potassiumVolumeControl.value.toFixed(Variables.potassiumPrecision))
+                                                               .arg(_calciumVolumeControl.value.toFixed(Variables.calciumPrecision))
 
     width           : 1000
     height          : 600
@@ -78,7 +78,7 @@
                 maximum         : 4.0       //             LEAHI-PRS-660 , LEAHI-PRS-241
                 step            : 1.0
                 defaultValue    : 2.0
-                decimal         : 1
+                decimal         : Variables.potassiumPrecision
             }
         }
 
@@ -99,7 +99,7 @@
                 maximum         : 3.5       //             LEAHI-PRS-660 , LEAHI-PRS-241
                 step            : 0.25
                 defaultValue    : 2.5
-                decimal         : 2
+                decimal         : Variables.calciumPrecision
             }
         }
 
Index: sources/gui/qml/globals/Variables.qml
===================================================================
diff -u -r16a8f25568b4636ebc31e76c86a8031940cc4ad7 -r53ec19e12772f2a73190323438106dc93e4a12df
--- sources/gui/qml/globals/Variables.qml	(.../Variables.qml)	(revision 16a8f25568b4636ebc31e76c86a8031940cc4ad7)
+++ sources/gui/qml/globals/Variables.qml	(.../Variables.qml)	(revision 53ec19e12772f2a73190323438106dc93e4a12df)
@@ -219,6 +219,12 @@
     // Dialysate Conductivity
     readonly property int dialysateCondPrecision    : 1
 
+    // Potassium
+    readonly property int  potassiumPrecision       : 1
+
+    // Calcium
+    readonly property int  calciumPrecision         : 2
+
     function sizeConverted(vSize, vSizePowers, vRound = 2) {
         return (  vSize
                 / vSizePowers   // convert from byte to Giga byte
Index: sources/gui/qml/pages/pretreatment/create/PreTreatmentCreateContent.qml
===================================================================
diff -u -r3604ca12ed47f4c60a12bb42efa4949ef01b7d95 -r53ec19e12772f2a73190323438106dc93e4a12df
--- sources/gui/qml/pages/pretreatment/create/PreTreatmentCreateContent.qml	(.../PreTreatmentCreateContent.qml)	(revision 3604ca12ed47f4c60a12bb42efa4949ef01b7d95)
+++ sources/gui/qml/pages/pretreatment/create/PreTreatmentCreateContent.qml	(.../PreTreatmentCreateContent.qml)	(revision 53ec19e12772f2a73190323438106dc93e4a12df)
@@ -347,7 +347,11 @@
                     enabled             : _root.editingEnabled
                     currentIndex        : vTreatmentCreate.acidConcentrate
                     model               : vTreatmentRanges.acidConcentrateOptions
-                    onClear             : vTreatmentCreate.acidConcentrateSet = false
+                    onClear             : {
+                        vTreatmentRanges.doClearAcidConcentrate(vTreatmentCreate.acidConcentrateSet)
+                        vTreatmentCreate.acidConcentrateSet = false
+                    }
+
                     onActivated         : {
                         vTreatmentCreate.acidConcentrate    = _acidConcentrateComboBox.currentIndex
                         vTreatmentCreate.acidConcentrateSet = true
Index: sources/model/settings/MSettings.cpp
===================================================================
diff -u -ra5760947d3ed0d2748ba023a1c25e3c6aa0b1de1 -r53ec19e12772f2a73190323438106dc93e4a12df
--- sources/model/settings/MSettings.cpp	(.../MSettings.cpp)	(revision a5760947d3ed0d2748ba023a1c25e3c6aa0b1de1)
+++ sources/model/settings/MSettings.cpp	(.../MSettings.cpp)	(revision 53ec19e12772f2a73190323438106dc93e4a12df)
@@ -142,6 +142,20 @@
     }
 }
 
+/*!
+ * \brief   MSettings::remove
+ * \details The function to be used to remove elements in the settings
+ * \param   vGroup      - the group of the settings
+ * \param   vKey        - the key to be removed under the group vGroup
+ * \param   vValue      - the value of the key to be removed under group vGroup for the key vKey
+ */
+void  MSettings::remove    (const QString &vCategory, const QString &vGroup, const QString &vKey, const QVariant &vValue)
+{
+    TKeyValue   keyValue  (vKey, vValue);
+    int index = _settings[vCategory][vGroup].indexOf(keyValue);
+    _settings[vCategory][vGroup].removeAt(index);
+}
+
 QString MSettings::systemLocale     () { return value(Storage::Settings_Category_Locale, "Localization", "Locale"   ).toString(); }
 QString MSettings::systemLanguage   () { return value(Storage::Settings_Category_Locale, "Localization", "Language" ).toString(); }
 
Index: sources/model/settings/MSettings.h
===================================================================
diff -u -ra5760947d3ed0d2748ba023a1c25e3c6aa0b1de1 -r53ec19e12772f2a73190323438106dc93e4a12df
--- sources/model/settings/MSettings.h	(.../MSettings.h)	(revision a5760947d3ed0d2748ba023a1c25e3c6aa0b1de1)
+++ sources/model/settings/MSettings.h	(.../MSettings.h)	(revision 53ec19e12772f2a73190323438106dc93e4a12df)
@@ -83,6 +83,7 @@
     QVariant        value    (const QString &vCategory, const QString &vGroup   , const QString &vKey);
 
     void            add      (const QString &vCategory, const QString &vGroup   , const QString &vKey, const QVariant &vValue, bool vEnableDuplicateKeys);
+    void            remove   (const QString &vCategory, const QString &vGroup   , const QString &vKey, const QVariant &vValue);
 
     QString         systemLocale    ();
     QString         systemLanguage  ();
Index: sources/view/hd/data/VTreatmentRanges.cpp
===================================================================
diff -u -r16a8f25568b4636ebc31e76c86a8031940cc4ad7 -r53ec19e12772f2a73190323438106dc93e4a12df
--- sources/view/hd/data/VTreatmentRanges.cpp	(.../VTreatmentRanges.cpp)	(revision 16a8f25568b4636ebc31e76c86a8031940cc4ad7)
+++ sources/view/hd/data/VTreatmentRanges.cpp	(.../VTreatmentRanges.cpp)	(revision 53ec19e12772f2a73190323438106dc93e4a12df)
@@ -54,19 +54,44 @@
  */
 void View::VTreatmentRanges::doSaveAcidConcentrate  (const QString &vOption)
 {
-    QString mCategory = ::Settings_Category_DataList;
+    QString mCategory = Storage::Settings_Category_DataList;
 
     _Settings.add(mCategory,
                   "Acid Concentrate Options",
                   vOption,
-                  QVariant(),
+                  QVariant("temp"), // set temp string to know to remove later
                   false );
 
     // update
-//    emit acidConcentrateOptionsChanged();
     acidConcentrateOptions ( _Settings.keys(mCategory, "Acid Concentrate Options" ));
 }
 
+/**
+ * \brief   VTreatmentRanges::doClearAcidConcentrate
+ * \param vSet - Bool to only clear options list if combobox is active
+ * \details Clear any custum Acid Concentrate entered by user
+ */
+void View::VTreatmentRanges::doClearAcidConcentrate  (const bool &vSet)
+{
+    if ( ! vSet ) { return; }
+
+    QString mCategory = Storage::Settings_Category_DataList;
+    int size = _Settings.keys(mCategory, "Acid Concentrate Options" ).size();
+
+    for ( int i = size - 1; i >= 0; --i ) {
+        // remove any populated values. The original from .config are empty strings
+        if ( ! _Settings.values(mCategory, "Acid Concentrate Options" )[i].toString().isEmpty() ) {
+            _Settings.remove(mCategory,
+                             "Acid Concentrate Options",
+                             _Settings.keys(mCategory, "Acid Concentrate Options")[i],
+                             _Settings.values(mCategory, "Acid Concentrate Options" )[i]);
+        }
+    }
+
+    // update
+    acidConcentrateOptions ( _Settings.keys(mCategory, "Acid Concentrate Options" ));
+}
+
 /*!
  * \brief   VTreatmentCreate::onSettingsDone
  * \details fills the items below, read from the settings file, when the reading is notified done by ApplicationController.
Index: sources/view/hd/data/VTreatmentRanges.h
===================================================================
diff -u -r16a8f25568b4636ebc31e76c86a8031940cc4ad7 -r53ec19e12772f2a73190323438106dc93e4a12df
--- sources/view/hd/data/VTreatmentRanges.h	(.../VTreatmentRanges.h)	(revision 16a8f25568b4636ebc31e76c86a8031940cc4ad7)
+++ sources/view/hd/data/VTreatmentRanges.h	(.../VTreatmentRanges.h)	(revision 53ec19e12772f2a73190323438106dc93e4a12df)
@@ -79,6 +79,7 @@
     void didTreatmentRangesDone(bool vPass);
 
 public slots:
-    void doSaveAcidConcentrate  (const QString &vOption);
+    void doSaveAcidConcentrate  (const QString  &vOption);
+    void doClearAcidConcentrate (const bool     &vSet);
 };
 }