diff --git a/src/db/db/dbDeepEdges.cc b/src/db/db/dbDeepEdges.cc
index c0fc78fc4..55aee834b 100644
--- a/src/db/db/dbDeepEdges.cc
+++ b/src/db/db/dbDeepEdges.cc
@@ -476,14 +476,50 @@ std::string DeepEdges::to_string (size_t nmax) const
 
 EdgesDelegate *DeepEdges::filter_in_place (const EdgeFilterBase &filter)
 {
-  //  TODO: implement
-  return AsIfFlatEdges::filter_in_place (filter);
+  //  TODO: implement to be really in-place
+  return filtered (filter);
 }
 
 EdgesDelegate *DeepEdges::filtered (const EdgeFilterBase &filter) const
 {
-  //  TODO: implement
-  return AsIfFlatEdges::filtered (filter);
+  ensure_merged_edges_valid ();
+
+  std::auto_ptr<VariantsCollectorBase> vars;
+
+  if (filter.isotropic ()) {
+    vars.reset (new db::cell_variants_collector<db::MagnificationReducer> ());
+  } else {
+    vars.reset (new db::cell_variants_collector<db::MagnificationAndOrientationReducer> ());
+  }
+
+  vars->collect (m_merged_edges.layout (), m_merged_edges.initial_cell ());
+
+  //  NOTE: m_merged_polygons is mutable, so why is the const_cast needed?
+  const_cast<db::DeepLayer &> (m_merged_edges).separate_variants (*vars);
+
+  db::Layout &layout = m_merged_edges.layout ();
+
+  std::auto_ptr<db::DeepEdges> res (new db::DeepEdges (m_merged_edges.derived ()));
+  for (db::Layout::iterator c = layout.begin (); c != layout.end (); ++c) {
+
+    const std::map<db::ICplxTrans, size_t> &v = vars->variants (c->cell_index ());
+    tl_assert (v.size () == size_t (1));
+    const db::ICplxTrans &tr = v.begin ()->first;
+
+    const db::Shapes &s = c->shapes (m_merged_edges.layer ());
+    db::Shapes &st = c->shapes (res->deep_layer ().layer ());
+
+    for (db::Shapes::shape_iterator si = s.begin (db::ShapeIterator::Edges); ! si.at_end (); ++si) {
+      db::Edge edge = si->edge ();
+      if (filter.selected (edge.transformed (tr))) {
+        st.insert (edge);
+      }
+    }
+
+  }
+
+  res->set_is_merged (true);
+  return res.release ();
 }
 
 EdgesDelegate *DeepEdges::merged_in_place ()
diff --git a/src/db/unit_tests/dbDeepEdgesTests.cc b/src/db/unit_tests/dbDeepEdgesTests.cc
index f1ea9b6bd..2c14840b6 100644
--- a/src/db/unit_tests/dbDeepEdgesTests.cc
+++ b/src/db/unit_tests/dbDeepEdgesTests.cc
@@ -193,3 +193,57 @@ TEST(4_Edge2PolygonBooleans)
   db::compare_layouts (_this, target, tl::testsrc () + "/testdata/algo/deep_edges_au4.gds");
 }
 
+TEST(5_Filters)
+{
+  db::Layout ly;
+  {
+    std::string fn (tl::testsrc ());
+    fn += "/testdata/algo/deep_region_area_peri_l1.gds";
+    tl::InputStream stream (fn);
+    db::Reader reader (stream);
+    reader.read (ly);
+  }
+
+  db::cell_index_type top_cell_index = *ly.begin_top_down ();
+  db::Cell &top_cell = ly.cell (top_cell_index);
+
+  db::DeepShapeStore dss;
+
+  unsigned int l2 = ly.get_layer (db::LayerProperties (2, 0));
+
+  db::Region r2 (db::RecursiveShapeIterator (ly, top_cell, l2), dss);
+  db::Edges e2 = r2.edges ();
+
+  {
+    db::Layout target;
+    unsigned int target_top_cell_index = target.add_cell (ly.cell_name (top_cell_index));
+
+    target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (2, 0)), r2);
+
+    db::EdgeLengthFilter elf1 (0, 40000, false);
+    db::EdgeLengthFilter elf2 (0, 30000, true);
+
+    target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (10, 0)), e2.filtered (elf1));
+    target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (11, 0)), e2.filtered (elf2));
+
+    CHECKPOINT();
+    db::compare_layouts (_this, target, tl::testsrc () + "/testdata/algo/deep_edges_au5a.gds");
+  }
+
+  {
+    db::Layout target;
+    unsigned int target_top_cell_index = target.add_cell (ly.cell_name (top_cell_index));
+
+    target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (2, 0)), r2);
+
+    db::EdgeOrientationFilter eof1 (0, 1, false);
+    db::EdgeOrientationFilter eof2 (0, 1, true);
+
+    target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (10, 0)), e2.filtered (eof1));
+    target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (11, 0)), e2.filtered (eof2));
+
+    CHECKPOINT();
+    db::compare_layouts (_this, target, tl::testsrc () + "/testdata/algo/deep_edges_au5b.gds");
+  }
+}
+
diff --git a/testdata/algo/deep_edges_au5a.gds b/testdata/algo/deep_edges_au5a.gds
new file mode 100644
index 000000000..28805aa0d
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diff --git a/testdata/algo/deep_edges_au5b.gds b/testdata/algo/deep_edges_au5b.gds
new file mode 100644
index 000000000..538b90698
Binary files /dev/null and b/testdata/algo/deep_edges_au5b.gds differ