diff --git a/src/src/main/java/com/my/graphiteDigesterBg/step/StepHeating.java b/src/src/main/java/com/my/graphiteDigesterBg/step/StepHeating.java
index e8cd3a3..04dff44 100644
--- a/src/src/main/java/com/my/graphiteDigesterBg/step/StepHeating.java
+++ b/src/src/main/java/com/my/graphiteDigesterBg/step/StepHeating.java
@@ -12,7 +12,7 @@ public class StepHeating extends DiTaskStepBase {
     public static final Logger LOG = LoggerFactory.getLogger(StepHeating.class);
     // temperature
     public Integer temperature;
-    // duration in seconds
+    // duration in minutes
     public Integer duration;
 
     @Override
@@ -22,7 +22,7 @@ public class StepHeating extends DiTaskStepBase {
         var heating = new MoveHeatPlateSlotHeating();
         heating.slotIndex = task.slotIndex;
         heating.temperature = this.temperature;
-        heating.duration = this.duration * 60;
+        heating.duration = this.duration;
         heating.setDevice(task.getDevice());
         heating.onFinish(() -> {
             task.setStatus(DiTask.TaskStatus.READY);
diff --git a/src/src/main/java/com/my/graphiteDigesterBg/step/StepPump.java b/src/src/main/java/com/my/graphiteDigesterBg/step/StepPump.java
index c21616a..d480503 100644
--- a/src/src/main/java/com/my/graphiteDigesterBg/step/StepPump.java
+++ b/src/src/main/java/com/my/graphiteDigesterBg/step/StepPump.java
@@ -1,6 +1,12 @@
 package com.my.graphiteDigesterBg.step;
 import com.my.graphiteDigesterBg.diframe.DiTaskStepBase;
 import com.my.graphiteDigesterBg.diframe.TaskStep;
+import com.my.graphiteDigesterBg.model.MdbOperationLog;
+import com.my.graphiteDigesterBg.move.MoveLiquidAdd;
+import com.my.graphiteDigesterBg.move.MoveMoveTubeRackFromHeatPlateToLiquidPlate;
+import com.my.graphiteDigesterBg.move.MoveMoveTubeRackFromLiquidPlateToHeatPlate;
+import com.my.graphiteDigesterBg.task.TaskDigestion;
+
 @TaskStep(name="Pump")
 public class StepPump extends DiTaskStepBase {
     // type
@@ -12,6 +18,26 @@ public class StepPump extends DiTaskStepBase {
 
     @Override
     public void run() {
-        System.out.println("StepPump.run()");
+        var task = (TaskDigestion)this.getTask();
+
+        // move tube rack from heat plate to liquid plate
+        var moveTubeRackFromHeatPlateToLiquidPlate = new MoveMoveTubeRackFromHeatPlateToLiquidPlate();
+        moveTubeRackFromHeatPlateToLiquidPlate.setDevice(task.getDevice());
+        moveTubeRackFromHeatPlateToLiquidPlate.slotIndex = task.slotIndex;
+        moveTubeRackFromHeatPlateToLiquidPlate.run();
+
+        // add liquid
+        var liquidAdd = new MoveLiquidAdd();
+        liquidAdd.setDevice(task.getDevice());
+        liquidAdd.shakeTimes = this.shake;
+        liquidAdd.liquidType = this.type;
+        liquidAdd.liquidVolume = this.amount;
+        liquidAdd.run();
+
+        // move tube rack from liquid plate to heat plate
+        var moveTubeRackFromLiquidPlateToHeatPlate = new MoveMoveTubeRackFromLiquidPlateToHeatPlate();
+        moveTubeRackFromLiquidPlateToHeatPlate.setDevice(task.getDevice());
+        moveTubeRackFromLiquidPlateToHeatPlate.slotIndex = task.slotIndex;
+        moveTubeRackFromLiquidPlateToHeatPlate.run();
     }
 }