diff --git a/app/api_topologies.go b/app/api_topologies.go
index f62511e3f..6a3af6f1d 100644
--- a/app/api_topologies.go
+++ b/app/api_topologies.go
@@ -4,6 +4,7 @@ import (
 	"net/http"
 
 	"github.com/weaveworks/scope/render"
+	"github.com/weaveworks/scope/report"
 	"github.com/weaveworks/scope/xfer"
 )
 
@@ -27,6 +28,7 @@ type topologyStats struct {
 	NodeCount          int `json:"node_count"`
 	NonpseudoNodeCount int `json:"nonpseudo_node_count"`
 	EdgeCount          int `json:"edge_count"`
+	FilteredNodes      int `json:"filtered_nodes"`
 }
 
 // makeTopologyList returns a handler that yields an APITopologyList.
@@ -41,16 +43,18 @@ func makeTopologyList(rep xfer.Reporter) func(w http.ResponseWriter, r *http.Req
 			if def.parent != "" {
 				continue
 			}
+			decorateTopologyForRequest(r, &def)
 
 			// Collect all sub-topologies of this one, depth=1 only.
 			subTopologies := []APITopologyDesc{}
 			for subName, subDef := range topologyRegistry {
 				if subDef.parent == name {
+					decorateTopologyForRequest(r, &subDef)
 					subTopologies = append(subTopologies, APITopologyDesc{
 						Name:    subDef.human,
 						URL:     "/api/topology/" + subName,
 						Options: makeTopologyOptions(subDef),
-						Stats:   stats(subDef.renderer.Render(rpt)),
+						Stats:   stats(subDef.renderer, rpt),
 					})
 				}
 			}
@@ -61,7 +65,7 @@ func makeTopologyList(rep xfer.Reporter) func(w http.ResponseWriter, r *http.Req
 				URL:           "/api/topology/" + name,
 				SubTopologies: subTopologies,
 				Options:       makeTopologyOptions(def),
-				Stats:         stats(def.renderer.Render(rpt)),
+				Stats:         stats(def.renderer, rpt),
 			})
 		}
 		respondWith(w, http.StatusOK, topologies)
@@ -82,14 +86,14 @@ func makeTopologyOptions(view topologyView) map[string][]APITopologyOption {
 	return options
 }
 
-func stats(r render.RenderableNodes) *topologyStats {
+func stats(renderer render.Renderer, rpt report.Report) *topologyStats {
 	var (
 		nodes     int
 		realNodes int
 		edges     int
 	)
 
-	for _, n := range r {
+	for _, n := range renderer.Render(rpt) {
 		nodes++
 		if !n.Pseudo {
 			realNodes++
@@ -97,9 +101,12 @@ func stats(r render.RenderableNodes) *topologyStats {
 		edges += len(n.Adjacency)
 	}
 
+	renderStats := renderer.Stats(rpt)
+
 	return &topologyStats{
 		NodeCount:          nodes,
 		NonpseudoNodeCount: realNodes,
 		EdgeCount:          edges,
+		FilteredNodes:      renderStats.FilteredNodes,
 	}
 }
diff --git a/app/router.go b/app/router.go
index 9e99c3ed3..441580457 100644
--- a/app/router.go
+++ b/app/router.go
@@ -100,6 +100,17 @@ func makeReportPostHandler(a xfer.Adder) http.HandlerFunc {
 	}
 }
 
+func decorateTopologyForRequest(r *http.Request, topology *topologyView) {
+	for param, opts := range topology.options {
+		value := r.FormValue(param)
+		for _, opt := range opts {
+			if (value == "" && opt.def) || (opt.value != "" && opt.value == value) {
+				topology.renderer = opt.decorator(topology.renderer)
+			}
+		}
+	}
+}
+
 func captureTopology(rep xfer.Reporter, f func(xfer.Reporter, topologyView, http.ResponseWriter, *http.Request)) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		topology, ok := topologyRegistry[mux.Vars(r)["topology"]]
@@ -107,14 +118,7 @@ func captureTopology(rep xfer.Reporter, f func(xfer.Reporter, topologyView, http
 			http.NotFound(w, r)
 			return
 		}
-		for param, opts := range topology.options {
-			value := r.FormValue(param)
-			for _, opt := range opts {
-				if (value == "" && opt.def) || (opt.value != "" && opt.value == value) {
-					topology.renderer = opt.decorator(topology.renderer)
-				}
-			}
-		}
+		decorateTopologyForRequest(r, &topology)
 		f(rep, topology, w, r)
 	}
 }
@@ -135,7 +139,7 @@ var topologyRegistry = map[string]topologyView{
 	"applications": {
 		human:    "Applications",
 		parent:   "",
-		renderer: render.FilterUnconnected(render.ProcessWithContainerNameRenderer{}),
+		renderer: render.FilterUnconnected(render.ProcessWithContainerNameRenderer),
 	},
 	"applications-by-name": {
 		human:    "by name",
@@ -145,7 +149,7 @@ var topologyRegistry = map[string]topologyView{
 	"containers": {
 		human:    "Containers",
 		parent:   "",
-		renderer: render.ContainerWithImageNameRenderer{},
+		renderer: render.ContainerWithImageNameRenderer,
 		options: optionParams{"system": {
 			{"show", "System containers shown", false, nop},
 			{"hide", "System containers hidden", true, render.FilterSystem},
diff --git a/render/render.go b/render/render.go
index 0222c4fce..d964168e6 100644
--- a/render/render.go
+++ b/render/render.go
@@ -11,6 +11,18 @@ import (
 type Renderer interface {
 	Render(report.Report) RenderableNodes
 	EdgeMetadata(rpt report.Report, localID, remoteID string) report.EdgeMetadata
+	Stats(report.Report) Stats
+}
+
+// Stats is the type returned by Renderer.Stats
+type Stats struct {
+	FilteredNodes int
+}
+
+func (s Stats) merge(other Stats) Stats {
+	return Stats{
+		FilteredNodes: s.FilteredNodes + other.FilteredNodes,
+	}
 }
 
 // Reduce renderer is a Renderer which merges together the output of several
@@ -40,6 +52,15 @@ func (r Reduce) EdgeMetadata(rpt report.Report, localID, remoteID string) report
 	return metadata
 }
 
+// Stats implements Renderer
+func (r Reduce) Stats(rpt report.Report) Stats {
+	var result Stats
+	for _, renderer := range r {
+		result = result.merge(renderer.Stats(rpt))
+	}
+	return result
+}
+
 // Map is a Renderer which produces a set of RenderableNodes from the set of
 // RenderableNodes produced by another Renderer.
 type Map struct {
@@ -54,6 +75,14 @@ func (m Map) Render(rpt report.Report) RenderableNodes {
 	return output
 }
 
+// Stats implements Renderer
+func (m Map) Stats(rpt report.Report) Stats {
+	// There doesn't seem to be an instance where we want stats to recurse
+	// through Maps - for instance we don't want to see the number of filtered
+	// processes in the container renderer.
+	return Stats{}
+}
+
 func (m Map) render(rpt report.Report) (RenderableNodes, map[string]report.IDList) {
 	var (
 		input         = m.Renderer.Render(rpt)
@@ -177,13 +206,21 @@ type Filter struct {
 
 // Render implements Renderer
 func (f Filter) Render(rpt report.Report) RenderableNodes {
+	nodes, _ := f.render(rpt)
+	return nodes
+}
+
+func (f Filter) render(rpt report.Report) (RenderableNodes, int) {
 	output := RenderableNodes{}
 	inDegrees := map[string]int{}
+	filtered := 0
 	for id, node := range f.Renderer.Render(rpt) {
 		if f.FilterFunc(node) {
 			output[id] = node
+			inDegrees[id] = 0
+		} else {
+			filtered++
 		}
-		inDegrees[id] = 0
 	}
 
 	// Deleted nodes also need to be cut as destinations in adjacency lists.
@@ -209,8 +246,17 @@ func (f Filter) Render(rpt report.Report) RenderableNodes {
 			continue
 		}
 		delete(output, id)
+		filtered++
 	}
-	return output
+	return output, filtered
+}
+
+// Stats implements Renderer
+func (f Filter) Stats(rpt report.Report) Stats {
+	_, filtered := f.render(rpt)
+	var upstream = f.Renderer.Stats(rpt)
+	upstream.FilteredNodes += filtered
+	return upstream
 }
 
 // IsConnected is the key added to Node.Metadata by ColorConnected
diff --git a/render/render_test.go b/render/render_test.go
index f12f080b9..ed27099b4 100644
--- a/render/render_test.go
+++ b/render/render_test.go
@@ -20,6 +20,9 @@ func (m mockRenderer) Render(rpt report.Report) render.RenderableNodes {
 func (m mockRenderer) EdgeMetadata(rpt report.Report, localID, remoteID string) report.EdgeMetadata {
 	return m.edgeMetadata
 }
+func (m mockRenderer) Stats(rpt report.Report) render.Stats {
+	return render.Stats{}
+}
 
 func TestReduceRender(t *testing.T) {
 	renderer := render.Reduce([]render.Renderer{
diff --git a/render/selectors.go b/render/selectors.go
index 88f186202..aafab995f 100644
--- a/render/selectors.go
+++ b/render/selectors.go
@@ -29,6 +29,11 @@ func (t TopologySelector) EdgeMetadata(rpt report.Report, srcID, dstID string) r
 	return metadata
 }
 
+// Stats implements Renderer
+func (t TopologySelector) Stats(r report.Report) Stats {
+	return Stats{}
+}
+
 // MakeRenderableNodes converts a topology to a set of RenderableNodes
 func MakeRenderableNodes(t report.Topology) RenderableNodes {
 	result := RenderableNodes{}
diff --git a/render/topologies.go b/render/topologies.go
index aff608093..13c10e700 100644
--- a/render/topologies.go
+++ b/render/topologies.go
@@ -27,14 +27,14 @@ var ProcessRenderer = MakeReduce(
 	},
 )
 
-// ProcessWithContainerNameRenderer is a Renderer which produces a process
+// processWithContainerNameRenderer is a Renderer which produces a process
 // graph enriched with container names where appropriate
-type ProcessWithContainerNameRenderer struct{}
+type processWithContainerNameRenderer struct {
+	Renderer
+}
 
-// Render produces a process graph where the minor labels contain the
-// container name, if found.
-func (r ProcessWithContainerNameRenderer) Render(rpt report.Report) RenderableNodes {
-	processes := ProcessRenderer.Render(rpt)
+func (r processWithContainerNameRenderer) Render(rpt report.Report) RenderableNodes {
+	processes := r.Renderer.Render(rpt)
 	containers := Map{
 		MapFunc:  MapContainerIdentity,
 		Renderer: SelectContainer,
@@ -60,10 +60,9 @@ func (r ProcessWithContainerNameRenderer) Render(rpt report.Report) RenderableNo
 	return processes
 }
 
-// EdgeMetadata produces an EdgeMetadata for a given edge.
-func (r ProcessWithContainerNameRenderer) EdgeMetadata(rpt report.Report, localID, remoteID string) report.EdgeMetadata {
-	return ProcessRenderer.EdgeMetadata(rpt, localID, remoteID)
-}
+// ProcessWithContainerNameRenderer is a Renderer which produces a process
+// graph enriched with container names where appropriate
+var ProcessWithContainerNameRenderer = processWithContainerNameRenderer{ProcessRenderer}
 
 // ProcessRenderer is a Renderer which produces a renderable process
 // name graph by munging the progess graph.
@@ -120,14 +119,14 @@ var ContainerRenderer = MakeReduce(
 	},
 )
 
-// ContainerWithImageNameRenderer is a Renderer which produces a container
-// graph where the ranks are the image names, not their IDs
-type ContainerWithImageNameRenderer struct{}
+type containerWithImageNameRenderer struct {
+	Renderer
+}
 
 // Render produces a process graph where the minor labels contain the
 // container name, if found.
-func (r ContainerWithImageNameRenderer) Render(rpt report.Report) RenderableNodes {
-	containers := ContainerRenderer.Render(rpt)
+func (r containerWithImageNameRenderer) Render(rpt report.Report) RenderableNodes {
+	containers := r.Renderer.Render(rpt)
 	images := Map{
 		MapFunc:  MapContainerImageIdentity,
 		Renderer: SelectContainerImage,
@@ -149,10 +148,9 @@ func (r ContainerWithImageNameRenderer) Render(rpt report.Report) RenderableNode
 	return containers
 }
 
-// EdgeMetadata produces an EdgeMetadata for a given edge.
-func (r ContainerWithImageNameRenderer) EdgeMetadata(rpt report.Report, localID, remoteID string) report.EdgeMetadata {
-	return ContainerRenderer.EdgeMetadata(rpt, localID, remoteID)
-}
+// ContainerWithImageNameRenderer is a Renderer which produces a container
+// graph where the ranks are the image names, not their IDs
+var ContainerWithImageNameRenderer = containerWithImageNameRenderer{ContainerRenderer}
 
 // ContainerImageRenderer is a Renderer which produces a renderable container
 // image graph by merging the container graph and the container image topology.
diff --git a/render/topologies_test.go b/render/topologies_test.go
index e87e0b229..07c5ab865 100644
--- a/render/topologies_test.go
+++ b/render/topologies_test.go
@@ -27,7 +27,7 @@ func TestProcessNameRenderer(t *testing.T) {
 }
 
 func TestContainerRenderer(t *testing.T) {
-	have := (render.ContainerWithImageNameRenderer{}.Render(test.Report)).Prune()
+	have := (render.ContainerWithImageNameRenderer.Render(test.Report)).Prune()
 	want := expected.RenderedContainers
 	if !reflect.DeepEqual(want, have) {
 		t.Error(test.Diff(want, have))
@@ -39,7 +39,7 @@ func TestContainerFilterRenderer(t *testing.T) {
 	// it is filtered out correctly.
 	input := test.Report.Copy()
 	input.Container.Nodes[test.ClientContainerNodeID].Metadata[docker.LabelPrefix+"works.weave.role"] = "system"
-	have := render.FilterSystem(render.ContainerWithImageNameRenderer{}).Render(input).Prune()
+	have := render.FilterSystem(render.ContainerWithImageNameRenderer).Render(input).Prune()
 	want := expected.RenderedContainers.Copy()
 	delete(want, test.ClientContainerID)
 	if !reflect.DeepEqual(want, have) {