diff --git a/pkg/object/search.go b/pkg/object/search.go
index 2fdcd9e..167f21f 100644
--- a/pkg/object/search.go
+++ b/pkg/object/search.go
@@ -173,6 +173,13 @@ func (f *SearchFilters) addReservedFilter(op SearchMatchType, keyTyp filterKeyTy
 	f.addFilter(op, keyTyp, "", val)
 }
 
+// addFlagFilters adds filters that works like flags: they don't need to have
+// specific match type or value. They processed by NeoFS nodes by the fact
+// of presence in search query. E.g.: PHY, ROOT.
+func (f *SearchFilters) addFlagFilter(keyTyp filterKeyType) {
+	f.addFilter(MatchUnknown, keyTyp, "", staticStringer(""))
+}
+
 func (f *SearchFilters) AddObjectVersionFilter(op SearchMatchType, v *pkg.Version) {
 	f.addReservedFilter(op, fKeyVersion, v)
 }
@@ -199,28 +206,20 @@ func (f SearchFilters) ToV2() []*v2object.SearchFilter {
 	return result
 }
 
-func (f *SearchFilters) addRootFilter(val bool) {
-	f.addReservedFilter(MatchStringEqual, fKeyPropRoot, boolStringer(val))
+func (f *SearchFilters) addRootFilter() {
+	f.addFlagFilter(fKeyPropRoot)
 }
 
 func (f *SearchFilters) AddRootFilter() {
-	f.addRootFilter(true)
+	f.addRootFilter()
 }
 
-func (f *SearchFilters) AddNonRootFilter() {
-	f.addRootFilter(false)
-}
-
-func (f *SearchFilters) addPhyFilter(val bool) {
-	f.addReservedFilter(MatchStringEqual, fKeyPropPhy, boolStringer(val))
+func (f *SearchFilters) addPhyFilter() {
+	f.addFlagFilter(fKeyPropPhy)
 }
 
 func (f *SearchFilters) AddPhyFilter() {
-	f.addPhyFilter(true)
-}
-
-func (f *SearchFilters) AddNonPhyFilter() {
-	f.addPhyFilter(false)
+	f.addPhyFilter()
 }
 
 func (f *SearchFilters) addChildFreeFilter(val bool) {
diff --git a/pkg/object/search_test.go b/pkg/object/search_test.go
index f6caae7..ca28f1f 100644
--- a/pkg/object/search_test.go
+++ b/pkg/object/search_test.go
@@ -62,23 +62,9 @@ func TestSearchFilters_AddRootFilter(t *testing.T) {
 
 	f := (*fs)[0]
 
-	require.Equal(t, object.MatchStringEqual, f.Operation())
+	require.Equal(t, object.MatchUnknown, f.Operation())
 	require.Equal(t, v2object.FilterPropertyRoot, f.Header())
-	require.Equal(t, v2object.BooleanPropertyValueTrue, f.Value())
-}
-
-func TestSearchFilters_AddNonRootFilter(t *testing.T) {
-	fs := new(object.SearchFilters)
-
-	fs.AddNonRootFilter()
-
-	require.Len(t, *fs, 1)
-
-	f := (*fs)[0]
-
-	require.Equal(t, object.MatchStringEqual, f.Operation())
-	require.Equal(t, v2object.FilterPropertyRoot, f.Header())
-	require.Equal(t, v2object.BooleanPropertyValueFalse, f.Value())
+	require.Equal(t, "", f.Value())
 }
 
 func TestSearchFilters_AddPhyFilter(t *testing.T) {
@@ -90,23 +76,9 @@ func TestSearchFilters_AddPhyFilter(t *testing.T) {
 
 	f := (*fs)[0]
 
-	require.Equal(t, object.MatchStringEqual, f.Operation())
+	require.Equal(t, object.MatchUnknown, f.Operation())
 	require.Equal(t, v2object.FilterPropertyPhy, f.Header())
-	require.Equal(t, v2object.BooleanPropertyValueTrue, f.Value())
-}
-
-func TestSearchFilters_AddNonPhyFilter(t *testing.T) {
-	fs := new(object.SearchFilters)
-
-	fs.AddNonPhyFilter()
-
-	require.Len(t, *fs, 1)
-
-	f := (*fs)[0]
-
-	require.Equal(t, object.MatchStringEqual, f.Operation())
-	require.Equal(t, v2object.FilterPropertyPhy, f.Header())
-	require.Equal(t, v2object.BooleanPropertyValueFalse, f.Value())
+	require.Equal(t, "", f.Value())
 }
 
 func testOID() *object.ID {