diff --git a/netmap/policy.go b/netmap/policy.go
index 8826512..52cee8f 100644
--- a/netmap/policy.go
+++ b/netmap/policy.go
@@ -455,7 +455,7 @@ func (p PlacementPolicy) WriteStringTo(w io.StringWriter) (err error) {
 			return err
 		}
 
-		err = writeFilterStringTo(w, p.filters[i])
+		err = writeFilterStringTo(w, p.filters[i], false)
 		if err != nil {
 			return err
 		}
@@ -464,7 +464,7 @@ func (p PlacementPolicy) WriteStringTo(w io.StringWriter) (err error) {
 	return nil
 }
 
-func writeFilterStringTo(w io.StringWriter, f netmap.Filter) error {
+func writeFilterStringTo(w io.StringWriter, f netmap.Filter, mayNeedOuterBrackets bool) error {
 	var err error
 	var s string
 	op := f.GetOp()
@@ -489,7 +489,7 @@ func writeFilterStringTo(w io.StringWriter, f netmap.Filter) error {
 		if err != nil {
 			return err
 		}
-		err = writeFilterStringTo(w, inner[0])
+		err = writeFilterStringTo(w, inner[0], false)
 		if err != nil {
 			return err
 		}
@@ -498,6 +498,13 @@ func writeFilterStringTo(w io.StringWriter, f netmap.Filter) error {
 			return err
 		}
 	} else {
+		useBrackets := mayNeedOuterBrackets && op == netmap.OR && len(inner) > 1
+		if useBrackets {
+			_, err = w.WriteString("(")
+			if err != nil {
+				return err
+			}
+		}
 		for i := range inner {
 			if i != 0 {
 				_, err = w.WriteString(" " + op.String() + " ")
@@ -505,7 +512,13 @@ func writeFilterStringTo(w io.StringWriter, f netmap.Filter) error {
 					return err
 				}
 			}
-			err = writeFilterStringTo(w, inner[i])
+			err = writeFilterStringTo(w, inner[i], true)
+			if err != nil {
+				return err
+			}
+		}
+		if useBrackets {
+			_, err = w.WriteString(")")
 			if err != nil {
 				return err
 			}
diff --git a/netmap/policy_test.go b/netmap/policy_test.go
index 05b0c98..81b7b48 100644
--- a/netmap/policy_test.go
+++ b/netmap/policy_test.go
@@ -1,6 +1,7 @@
 package netmap_test
 
 import (
+	"strings"
 	"testing"
 
 	. "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/netmap"
@@ -29,6 +30,79 @@ func TestPlacementPolicyEncoding(t *testing.T) {
 	})
 }
 
+func TestPlacementPolicyWriteString(t *testing.T) {
+	var testCases = []struct {
+		name   string
+		input  string
+		output string // If the output is empty, make it equal to input.
+	}{
+		{
+			name: "no compound operators",
+			input: `REP 1
+CBF 1
+SELECT 1 FROM Color
+FILTER Color EQ Red AS Color`,
+		},
+		{
+			name: "no brackets in single level same-operator chain",
+			input: `REP 1
+CBF 1
+SELECT 1 FROM Color
+FILTER Color EQ Red OR Color EQ Blue OR Color EQ Green AS Color`,
+		},
+		{
+			name: "no brackets aroung higher precedence op",
+			input: `REP 1
+CBF 1
+SELECT 1 FROM Color
+FILTER Color EQ Red OR Color EQ Blue AND Color NE Green AS Color`,
+		},
+		{
+			name: "no brackets aroung higher precedence op, even if present in the input",
+			input: `REP 1
+CBF 1
+SELECT 1 FROM Color
+FILTER Color EQ Red OR (Color EQ Blue AND Color NE Green) AS Color`,
+			output: `REP 1
+CBF 1
+SELECT 1 FROM Color
+FILTER Color EQ Red OR Color EQ Blue AND Color NE Green AS Color`,
+		},
+		{
+			name: "brackets aroung lower precedence op",
+			input: `REP 1
+CBF 1
+SELECT 1 FROM Color
+FILTER (Color EQ Red OR Color EQ Blue) AND Color NE Green AS Color`,
+		},
+		{
+			name: "no extra brackets for bracketed same-operator chain",
+			input: `REP 1
+CBF 1
+SELECT 1 FROM Color
+FILTER (Color EQ Red OR Color EQ Blue OR Color EQ Yellow) AND Color NE Green AS Color`,
+		},
+	}
+
+	for _, tc := range testCases {
+		var p PlacementPolicy
+		require.NoError(t, p.DecodeString(tc.input))
+
+		var sb strings.Builder
+		require.NoError(t, p.WriteStringTo(&sb))
+
+		if tc.output == "" {
+			require.Equal(t, tc.input, sb.String())
+		} else {
+			require.Equal(t, tc.output, sb.String())
+
+			var p1 PlacementPolicy
+			require.NoError(t, p1.DecodeString(tc.output))
+			require.Equal(t, p, p1)
+		}
+	}
+}
+
 func TestDecodeSelectFilterExpr(t *testing.T) {
 	for _, s := range []string{
 		"SELECT 1 FROM *",