Index: sources/gui/qml/pages/treatment/TreatmentBegin.qml
===================================================================
diff -u -rccb91da4becded9a7ad409b758bba96784d9feba -r28f3f8dd18981262995386d29d3c2ab31418bfc4
--- sources/gui/qml/pages/treatment/TreatmentBegin.qml	(.../TreatmentBegin.qml)	(revision ccb91da4becded9a7ad409b758bba96784d9feba)
+++ sources/gui/qml/pages/treatment/TreatmentBegin.qml	(.../TreatmentBegin.qml)	(revision 28f3f8dd18981262995386d29d3c2ab31418bfc4)
@@ -112,23 +112,24 @@
     }
 
 
-    TouchRect { id: _nextButton
+    TouchRect { id: _startButton
         width   : 515
         height  :  70
         anchors {
             top: parent.top
             topMargin: 650
             horizontalCenter: parent.horizontalCenter
         }
-
+        disabled: ! _volumeSlider.isActive
         backgroundColor: Colors.backgroundButtonSelect
-
         text {
             text: qsTr("START")
             font.weight   : Font .DemiBold
             font.pixelSize: Fonts.fontPixelUltrafiltrationAdjustmentButton
         }
-        // onClicked: nextClicked( _private.adjusted.toFixed(_private.decimal) )
+        onClicked: {
+            clickedStart(vTreatmentAdjustmentUltrafiltrationInit.doAdjustment(_volumeSlider.value))
+        }
     }
 
     onVisibleChanged: {