diff --git a/src/EcsPreFilter.cs b/src/EcsPreFilter.cs
deleted file mode 100644
index 2f762a1..0000000
--- a/src/EcsPreFilter.cs
+++ /dev/null
@@ -1,36 +0,0 @@
-namespace DCFApixels.DragonECS
-{
-    public class EcsPreFilter
-    {
-
-    }
-
-    public class EcsPreFilterManager
-    {
-        private EcsWorld _world;
-        private EcsGroup _dirtyEntities;
-
-        public EcsPreFilterManager(EcsWorld world)
-        {
-            _world = world;
-            _dirtyEntities = EcsGroup.New(_world);
-        }
-
-        internal void AddDirty(int entityID)
-        {
-            _dirtyEntities.Add(entityID);
-        }
-    }
-    public class PoolListener : IEcsPoolEventListener
-    {
-        public void OnAdd(int entityID)
-        {
-        }
-        public void OnDel(int entityID)
-        {
-        }
-        public void OnGet(int entityID)
-        {
-        }
-    }
-}