diff --git a/include/boost/geometry/extensions/index/filters/nearest_filter.hpp b/include/boost/geometry/extensions/index/filters/nearest_filter.hpp
index ec6fcd9e0..adc871b7c 100644
--- a/include/boost/geometry/extensions/index/filters/nearest_filter.hpp
+++ b/include/boost/geometry/extensions/index/filters/nearest_filter.hpp
@@ -10,7 +10,9 @@
 #ifndef BOOST_GEOMETRY_EXTENSIONS_INDEX_FILTERS_NEAREST_FILTER_HPP
 #define BOOST_GEOMETRY_EXTENSIONS_INDEX_FILTERS_NEAREST_FILTER_HPP
 
-namespace boost { namespace geometry { namespace index { namespace filters {
+namespace boost { namespace geometry { namespace index {
+
+namespace filters {
 
 template <typename SpacialIndex>
 class nearest_filter
@@ -64,7 +66,7 @@ detail::nearest_filtered<Point> nearest_filtered(
     return detail::nearest_filtered<Point>(p, distance);
 }
 
-}}}} // namespace boost::geometry::index::filters
+} // namespace filters
 
 template<typename SpacialIndex, typename Point>
 boost::geometry::index::filters::nearest_filter<SpacialIndex>
@@ -75,4 +77,6 @@ boost::geometry::index::filters::nearest_filter<SpacialIndex>
     return boost::geometry::index::filters::nearest_filter<SpacialIndex>(si, f.point(), f.distance());
 }
 
+}}} // namespace boost::geometry::index
+
 #endif // BOOST_GEOMETRY_EXTENSIONS_INDEX_FILTERS_NEAREST_FILTER_HPP
diff --git a/include/boost/geometry/extensions/index/filters/spacial_filter.hpp b/include/boost/geometry/extensions/index/filters/spacial_filter.hpp
index 7e8b69a6c..7790471e0 100644
--- a/include/boost/geometry/extensions/index/filters/spacial_filter.hpp
+++ b/include/boost/geometry/extensions/index/filters/spacial_filter.hpp
@@ -10,7 +10,9 @@
 #ifndef BOOST_GEOMETRY_EXTENSIONS_INDEX_FILTERS_SPACIAL_FILTER_HPP
 #define BOOST_GEOMETRY_EXTENSIONS_INDEX_FILTERS_SPACIAL_FILTER_HPP
 
-namespace boost { namespace geometry { namespace index { namespace filters {
+namespace boost { namespace geometry { namespace index {
+    
+namespace filters {
 
 template <typename SpacialIndex>
 class spatial_filter
@@ -49,15 +51,17 @@ detail::spatially_filtered<Geometry> spatially_filtered(Geometry const& geom)
     return detail::spatially_filtered<Geometry>(geom);
 }
 
-}}}} // namespace boost::geometry::index::filters
+} // namespace filters
 
 template<typename SpacialIndex, typename Geometry>
-boost::geometry::index::filters::spatial_filter<SpacialIndex>
+index::filters::spatial_filter<SpacialIndex>
 operator|(
     SpacialIndex const& si,
-    boost::geometry::index::filters::detail::spatially_filtered<Geometry> const& f)
+    index::filters::detail::spatially_filtered<Geometry> const& f)
 {
-    return boost::geometry::index::filters::spatial_filter<SpacialIndex>(si, f.geometry());
+    return index::filters::spatial_filter<SpacialIndex>(si, f.geometry());
 }
 
+}}} // namespace boost::geometry::index
+
 #endif // BOOST_GEOMETRY_EXTENSIONS_INDEX_FILTERS_SPACIAL_FILTER_HPP
diff --git a/include/boost/geometry/extensions/index/rtree/filters.hpp b/include/boost/geometry/extensions/index/rtree/filters.hpp
index dcd598152..1f3a610b4 100644
--- a/include/boost/geometry/extensions/index/rtree/filters.hpp
+++ b/include/boost/geometry/extensions/index/rtree/filters.hpp
@@ -31,17 +31,17 @@ class spatial_filter< index::rtree<Value, Translator, Tag> >
 public:
     typedef typename std::deque<Value>::iterator iterator;
     typedef typename std::deque<Value>::const_iterator const_iterator;
-
+    
     template <typename Geometry>
-    spatial_filter(index::rtree<Value, Translator, Tag> const& rtree, Geometry const& geom)
+    inline spatial_filter(index::rtree<Value, Translator, Tag> const& rtree, Geometry const& geom)
     {
         rtree.find(geom, std::back_inserter(m_result));
     }
 
-    iterator begin() { return m_result.begin(); }
-    iterator end() { return m_result.end(); }
-    const_iterator begin() const { return m_result.begin(); }
-    const_iterator end() const { return m_result.end(); }
+    inline iterator begin() { return m_result.begin(); }
+    inline iterator end() { return m_result.end(); }
+    inline const_iterator begin() const { return m_result.begin(); }
+    inline const_iterator end() const { return m_result.end(); }
 
 private:
     std::deque<Value> m_result;
@@ -49,6 +49,19 @@ private:
 
 } // namespace filters
 
+// TODO: awulkiew - filter may be implemented in operator|
+
+//template<typename Value, typename Translator, typename Tag, typename Geometry>
+//std::deque<Value>
+//operator|(
+//    index::rtree<Value, Translator, Tag> const& si,
+//    index::filters::detail::spatially_filtered<Geometry> const& f)
+//{
+//    std::deque<Value> result;
+//    si.find(f.geometry(), std::back_inserter(result));
+//    return result;
+//}
+
 }}} // namespace boost::geometry::index
 
 #endif // BOOST_GEOMETRY_EXTENSIONS_INDEX_RTREE_FILTERS_HPP