diff --git a/pycassa/columnfamily.py b/pycassa/columnfamily.py
index ace81956..a6e60a05 100644
--- a/pycassa/columnfamily.py
+++ b/pycassa/columnfamily.py
@@ -6,9 +6,7 @@
 """
 
 import time
-import sys
 import uuid
-import threading
 import struct
 from UserDict import DictMixin
 
@@ -19,15 +17,10 @@
 import pycassa.util as util
 import pycassa.marshal as marshal
 import pycassa.types as types
-
-from batch import CfMutator
+from pycassa.batch import CfMutator
 
 __all__ = ['gm_timestamp', 'ColumnFamily', 'PooledColumnFamily']
 
-_NON_SLICE = 0
-_SLICE_START = 1
-_SLICE_FINISH = 2
-
 class ColumnValidatorDict(DictMixin):
 
     def __init__(self, other_dict={}):