diff --git a/src/Collections/EcsGroup.cs b/src/Collections/EcsGroup.cs
index fe112d7..4ce8cf5 100644
--- a/src/Collections/EcsGroup.cs
+++ b/src/Collections/EcsGroup.cs
@@ -44,11 +44,6 @@ namespace DCFApixels.DragonECS
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
             get { return _source.CapacityDense; }
         }
-        public int CapacitySparce //TODO remove
-        {
-            [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            get { return _source.CapacitySparce; }
-        }
         public bool IsReleazed
         {
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -174,11 +169,6 @@ namespace DCFApixels.DragonECS
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
             get => _dense.Length;
         }
-        public int CapacitySparce //TODO remove
-        {
-            [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            get => _sparse.Length;
-        }
         public EcsReadonlyGroup Readonly
         {
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -336,7 +326,7 @@ namespace DCFApixels.DragonECS
             {
                 Clear();
             }
-            for (int i = 0; i < span.Length; i++)
+            for (int i = 0; i < span.Count; i++)
             {
                 Add_Internal(span[i]);
             }
@@ -539,7 +529,7 @@ namespace DCFApixels.DragonECS
 #if (DEBUG && !DISABLE_DEBUG) || ENABLE_DRAGONECS_ASSERT_CHEKS
             if (_source.id != span.WorldID) Throw.Group_ArgumentDifferentWorldsException();
 #endif
-            if (span.Length != Count)
+            if (span.Count != Count)
                 return false;
             foreach (var item in span)
                 if (!Has(item))
diff --git a/src/Collections/EcsSpan.cs b/src/Collections/EcsSpan.cs
index 1a03d80..7494ea0 100644
--- a/src/Collections/EcsSpan.cs
+++ b/src/Collections/EcsSpan.cs
@@ -28,7 +28,7 @@ namespace DCFApixels.DragonECS
         {
             get { return EcsWorld.GetWorld(_worldID); }
         }
-        public int Length //TODO rename to Count
+        public int Count
         {
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
             get { return _values.Length; }
@@ -145,7 +145,7 @@ namespace DCFApixels.DragonECS
             public int Count { get { return _values.Length; } }
             public DebuggerProxy(EcsSpan span)
             {
-                _values = new int[span.Length];
+                _values = new int[span.Count];
                 span._values.CopyTo(_values);
                 _worldID = span._worldID;
             }
diff --git a/src/Executors/EcsWhereExecutor.cs b/src/Executors/EcsWhereExecutor.cs
index 0ec22e2..6c7ecde 100644
--- a/src/Executors/EcsWhereExecutor.cs
+++ b/src/Executors/EcsWhereExecutor.cs
@@ -54,7 +54,7 @@ namespace DCFApixels.DragonECS
             if (_lastWorldVersion != World.Version)
             {
                 result = _aspect.GetIteratorFor(span).CopyToSpan(ref _filteredEntities);
-                _filteredEntitiesCount = result.Length;
+                _filteredEntitiesCount = result.Count;
                 _lastWorldVersion = World.Version;
             }
             else