Index: sources/gui/qml/components/HeaderBar.qml
===================================================================
diff -u -rf0e262920199d1d5ebdbe3f1bf0c58c58a82d363 -ref583f0056a0fb8c66a64e132be159719b2bc2f6
--- sources/gui/qml/components/HeaderBar.qml	(.../HeaderBar.qml)	(revision f0e262920199d1d5ebdbe3f1bf0c58c58a82d363)
+++ sources/gui/qml/components/HeaderBar.qml	(.../HeaderBar.qml)	(revision ef583f0056a0fb8c66a64e132be159719b2bc2f6)
@@ -165,6 +165,14 @@
             onPressed       : _endTreatmentDialog.open()
         }
 
+        IconButton { id  : _waterSample
+            iconSize        : Variables.headerIconDiameter
+            iconImageSource : "qrc:/images/iWaterSample"
+            extraSpace      : _headerButtonRow.spacing
+
+            onPressed       : _headerbarWaterSampleDialysate.open()
+        }
+
         IconButton { id  : _prescriptionButton
             iconSize        : Variables.headerIconDiameter
             iconImageSource : "qrc:/images/iPrescription"