diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7e1e8052c..0a9b10482 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,5 @@
+* Enabled by default usage of `internal/pool` in `internal/query.Client`
+
 ## v3.79.1
 * Changed `trace.Table` and `trace.Query` traces
 * Implemented `internal/pool` the same as table client pool from `internal/table.Client`
diff --git a/internal/query/client.go b/internal/query/client.go
index 78a7467b3..a5d325449 100644
--- a/internal/query/client.go
+++ b/internal/query/client.go
@@ -559,11 +559,19 @@ func (c *Client) DoTx(ctx context.Context, op query.TxOperation, opts ...options
 	return nil
 }
 
-func newPool(
-	ctx context.Context, cfg *config.Config, createSession func(ctx context.Context) (*Session, error),
-) sessionPool {
-	if cfg.UseSessionPool() {
-		return pool.New(ctx,
+func New(ctx context.Context, balancer grpc.ClientConnInterface, cfg *config.Config) *Client {
+	onDone := trace.QueryOnNew(cfg.Trace(), &ctx,
+		stack.FunctionID("github.com/ydb-platform/ydb-go-sdk/v3/internal/query.New"),
+	)
+	defer onDone()
+
+	grpcClient := Ydb_Query_V1.NewQueryServiceClient(balancer)
+
+	client := &Client{
+		config:             cfg,
+		queryServiceClient: grpcClient,
+		done:               make(chan struct{}),
+		pool: pool.New(ctx,
 			pool.WithLimit[*Session, Session](cfg.PoolLimit()),
 			pool.WithTrace[*Session, Session](poolTrace(cfg.Trace())),
 			pool.WithCreateItemTimeout[*Session, Session](cfg.SessionCreateTimeout()),
@@ -580,52 +588,14 @@ func newPool(
 				}
 				defer cancelCreate()
 
-				s, err := createSession(createCtx)
+				s, err := createSession(createCtx, grpcClient, cfg)
 				if err != nil {
 					return nil, xerrors.WithStackTrace(err)
 				}
 
 				return s, nil
 			}),
-		)
-	}
-
-	return &poolStub{
-		createSession: createSession,
-	}
-}
-
-func New(ctx context.Context, balancer grpc.ClientConnInterface, cfg *config.Config) *Client {
-	onDone := trace.QueryOnNew(cfg.Trace(), &ctx,
-		stack.FunctionID("github.com/ydb-platform/ydb-go-sdk/v3/internal/query.New"),
-	)
-	defer onDone()
-
-	grpcClient := Ydb_Query_V1.NewQueryServiceClient(balancer)
-
-	client := &Client{
-		config:             cfg,
-		queryServiceClient: grpcClient,
-		done:               make(chan struct{}),
-		pool: newPool(ctx, cfg, func(ctx context.Context) (_ *Session, err error) {
-			var (
-				createCtx    context.Context
-				cancelCreate context.CancelFunc
-			)
-			if d := cfg.SessionCreateTimeout(); d > 0 {
-				createCtx, cancelCreate = xcontext.WithTimeout(ctx, d)
-			} else {
-				createCtx, cancelCreate = xcontext.WithCancel(ctx)
-			}
-			defer cancelCreate()
-
-			s, err := createSession(createCtx, grpcClient, cfg)
-			if err != nil {
-				return nil, xerrors.WithStackTrace(err)
-			}
-
-			return s, nil
-		}),
+		),
 	}
 
 	return client
diff --git a/internal/query/config/config.go b/internal/query/config/config.go
index 1eec4001b..7adb08242 100644
--- a/internal/query/config/config.go
+++ b/internal/query/config/config.go
@@ -1,7 +1,6 @@
 package config
 
 import (
-	"os"
 	"time"
 
 	"github.com/ydb-platform/ydb-go-sdk/v3/internal/config"
@@ -20,7 +19,6 @@ type Config struct {
 
 	poolLimit int
 
-	useSessionPool       bool
 	sessionCreateTimeout time.Duration
 	sessionDeleteTimeout time.Duration
 
@@ -44,7 +42,6 @@ func defaults() *Config {
 		sessionCreateTimeout: DefaultSessionCreateTimeout,
 		sessionDeleteTimeout: DefaultSessionDeleteTimeout,
 		trace:                &trace.Query{},
-		useSessionPool:       os.Getenv("YDB_GO_SDK_QUERY_SERVICE_USE_SESSION_POOL") != "",
 	}
 }
 
@@ -71,7 +68,3 @@ func (c *Config) SessionCreateTimeout() time.Duration {
 func (c *Config) SessionDeleteTimeout() time.Duration {
 	return c.sessionDeleteTimeout
 }
-
-func (c *Config) UseSessionPool() bool {
-	return c.useSessionPool
-}