diff --git a/QtPyLoT.py b/QtPyLoT.py
index 1caf4cd8..1855e491 100755
--- a/QtPyLoT.py
+++ b/QtPyLoT.py
@@ -247,19 +247,29 @@ class MainWindow(QMainWindow):
         pass #self.data.plotData(self.DataPlot)
 
     def filterData(self):
-        pass
+        if self.getData():
+            kwargs = {}
+            freq = self.filteroptions.getFreq()
+            if len(freq) > 1:
+                kwargs['freqmin'] = freq[0]
+                kwargs['freqmax'] = freq[1]
+            else:
+                kwargs['freq'] = freq
+            kwargs['type'] = self.filteroptions.getFilterType()
+            #kwargs['order'] = self.filteroptions.getOrder()
+            self.data.filter(**kwargs)
 
     def adjustFilterOptions(self):
-        filterOptions = None
+        filteroptions = None
         fstring = "Filter Options ({0})".format(self.getSeismicPhase())
         filterDlg = FilterOptionsDialog(titleString=fstring,
                                         parent=self,
                                         filterOptions=self.getFilterOptions())
         if filterDlg.exec_():
-            filterOptions = filterDlg.getFilterOptions()
+            filteroptions = filterDlg.getFilterOptions()
 
-        assert isinstance(filterOptions, FilterOptions)
-        self.setFilterOptions(filterOptions)
+        assert isinstance(filteroptions, FilterOptions)
+        self.setFilterOptions(filteroptions)
 
     def getFilterOptions(self):
         return self.filteroptions
diff --git a/pylot/core/read/data.py b/pylot/core/read/data.py
index 5b9250f1..8331c6a6 100644
--- a/pylot/core/read/data.py
+++ b/pylot/core/read/data.py
@@ -27,7 +27,10 @@ class Data(object):
 
     def __init__(self, parent=None, evtdata=None):
         try:
-            self.wfdata = read()
+            if parent:
+                self.wfdata = read(parent.fnames)
+            else:
+                self.wfdata = read()
         except IOError, e:
             msg = 'An I/O error occured while loading data!'
             inform = 'Variable wfdata will be empty.'
@@ -53,6 +56,7 @@ class Data(object):
         else:  # create an empty Event object
             self.newevent = True
             self.evtdata = Event()
+        self.orig = self.wfdata.copy()
 
     def isNew(self):
         return self.newevent
@@ -77,7 +81,6 @@ class Data(object):
                               not implemented: {1}'''.format(evtformat, e))
 
     def plotData(self, widget):
-
         pass #axes = widget.axes
 
     def getID(self):
diff --git a/pylot/core/read/inputs.py b/pylot/core/read/inputs.py
index ee840b8f..57999fb8 100644
--- a/pylot/core/read/inputs.py
+++ b/pylot/core/read/inputs.py
@@ -165,34 +165,37 @@ class FilterOptions(object):
     '''
     def __init__(self, filtertype='bandpass', freq=[2., 5.], order=3,
                  **kwargs):
-        self.setFilterType(filtertype)
-        self.setFreq(freq)
-        self.setOrder(order)
+        self._order = order
+        self._filtertype = filtertype
+        self._freq = freq
 
     def __str__(self):
         hrs = '''\n\tFilter parameter:\n
         Type:\t\t{ftype}\n
         Frequencies:\t{freq}\n
         Order:\t\t{order}\n
-        '''.format(ftype=self.getFilterType(),
-                   freq=self.getFreq(),
-                   order=self.getOrder())
+        '''.format(ftype=self.getFilterType,
+                   freq=self.getFreq,
+                   order=self.getOrder)
         return hrs
 
+    @property
     def getFreq(self):
-        return self.freq
+        return self.__getattribute__('_freq')
 
     def setFreq(self, freq):
-        self.freq = freq
+        self.__setattr__('_freq', freq)
 
+    @property
     def getOrder(self):
-        return self.order
+        return self.__getattribute__('_order')
 
     def setOrder(self, order):
-        self.order = order
+        self.__setattr__('_order', order)
 
+    @property
     def getFilterType(self):
-        return self.filterType
+        return self.__getattribute__('_filtertype')
 
     def setFilterType(self, filtertype):
-        self.filterType = filtertype
+        self.__setattr__('_filtertype', filtertype)
diff --git a/pylot/core/util/widgets.py b/pylot/core/util/widgets.py
index a6376f73..e937f2cf 100644
--- a/pylot/core/util/widgets.py
+++ b/pylot/core/util/widgets.py
@@ -166,7 +166,7 @@ class FilterOptionsDialog(QDialog):
         self.freqminSpinBox.setRange(5e-7, 1e6)
         self.freqminSpinBox.setDecimals(2)
         self.freqminSpinBox.setSuffix(' Hz')
-        self.freqminSpinBox.setValue(self.getFilterOptions().getFreq()[0])
+        self.freqminSpinBox.setValue(self.getFilterOptions().getFreq[0])
         self.freqmaxLabel = QLabel()
         self.freqmaxLabel.setText("maximum:")
         self.freqmaxSpinBox = QDoubleSpinBox()
@@ -174,7 +174,7 @@ class FilterOptionsDialog(QDialog):
         self.freqmaxSpinBox.setDecimals(2)
         self.freqmaxSpinBox.setSuffix(' Hz')
         if self.filterOptions.filterType in ['bandpass', 'bandstop']:
-            self.freqmaxSpinBox.setValue(self.getFilterOptions().getFreq()[1])
+            self.freqmaxSpinBox.setValue(self.getFilterOptions().getFreq[1])
 
         typeOptions = ["bandpass", "bandstop", "lowpass", "highpass"]