diff --git a/mlair/data_handler/data_handler_mixed_sampling.py b/mlair/data_handler/data_handler_mixed_sampling.py
index 2d49fad7ccb4e7c7f031760ae338a57f64684298..a389445e8af8db0559fd1bf8f3445475cb62082e 100644
--- a/mlair/data_handler/data_handler_mixed_sampling.py
+++ b/mlair/data_handler/data_handler_mixed_sampling.py
@@ -5,8 +5,8 @@ from mlair.data_handler.data_handler_single_station import DataHandlerSingleStat
 from mlair.data_handler.data_handler_with_filter import DataHandlerFirFilterSingleStation, \
     DataHandlerFilterSingleStation, DataHandlerClimateFirFilterSingleStation
 # from mlair.data_handler.data_handler_with_filter import DataHandlerKzFilterSingleStation
-from mlair.data_handler.data_handler_with_filter import DataHandlerClimateFirFilter, DataHandlerFirFilter, \
-    DataHandlerKzFilter
+from mlair.data_handler.data_handler_with_filter import DataHandlerClimateFirFilter, DataHandlerFirFilter
+# from mlair.data_handler.data_handler_with_filter import DataHandlerKzFilter
 from mlair.data_handler import DefaultDataHandler
 from mlair import helpers
 from mlair.helpers import remove_items