diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6b17280..dde900f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## v1.2.x
+
+- Add event Event::POOL occurs when Flow need to count IPs to process.
+
 ## v1.2.2
 
 - Flow can now use `Flow\JobInterface` as job input
diff --git a/examples/flow.php b/examples/flow.php
index 3a4ec3c..63fb476 100644
--- a/examples/flow.php
+++ b/examples/flow.php
@@ -35,7 +35,7 @@
 $job1 = static function (DataA $dataA) use ($driver): DataB {
     printf("*. #%d - Job 1 Calculating %d + %d\n", $dataA->id, $dataA->a, $dataA->b);
 
-    // simulating calculating some "light" operation from 0.1 to 1 seconds
+    // simulating calculating some "light" operation from 1 to 3 seconds
     $delay = random_int(1, 3);
     $driver->delay($delay);
     $d = $dataA->a + $dataA->b;
diff --git a/src/AsyncHandler/AsyncHandler.php b/src/AsyncHandler/AsyncHandler.php
index c81c5cc..264d391 100644
--- a/src/AsyncHandler/AsyncHandler.php
+++ b/src/AsyncHandler/AsyncHandler.php
@@ -7,6 +7,8 @@
 use Flow\AsyncHandlerInterface;
 use Flow\Event;
 use Flow\Event\AsyncEvent;
+use Flow\Event\PoolEvent;
+use Flow\IpPool;
 
 /**
  * @template T
@@ -15,10 +17,21 @@
  */
 final class AsyncHandler implements AsyncHandlerInterface
 {
+    /**
+     * @var IpPool<T>
+     */
+    private IpPool $ipPool;
+
+    public function __construct()
+    {
+        $this->ipPool = new IpPool();
+    }
+
     public static function getSubscribedEvents()
     {
         return [
             Event::ASYNC => 'async',
+            Event::POOL => 'pool',
         ];
     }
 
@@ -27,7 +40,18 @@ public function async(AsyncEvent $event): void
         $ip = $event->getIp();
         $async = $event->getAsync();
         $asyncJob = $async($event->getJob());
+
+        $popIp = $this->ipPool->addIp($ip);
+
         $next = $asyncJob($ip->data);
-        $next($event->getCallback());
+        $next(static function ($data) use ($event, $popIp) {
+            $event->getCallback()($data);
+            $popIp();
+        });
+    }
+
+    public function pool(PoolEvent $event): void
+    {
+        $event->addIps($this->ipPool->getIps());
     }
 }
diff --git a/src/AsyncHandler/BatchAsyncHandler.php b/src/AsyncHandler/BatchAsyncHandler.php
index 5462508..9f67467 100644
--- a/src/AsyncHandler/BatchAsyncHandler.php
+++ b/src/AsyncHandler/BatchAsyncHandler.php
@@ -7,28 +7,28 @@
 use Flow\AsyncHandlerInterface;
 use Flow\Event;
 use Flow\Event\AsyncEvent;
+use Flow\Event\PoolEvent;
 use Symfony\Component\Messenger\Handler\Acknowledger;
 use Symfony\Component\Messenger\Handler\BatchHandlerInterface;
 use Symfony\Component\Messenger\Handler\BatchHandlerTrait;
 use Throwable;
 
 /**
- * @template T1
- * @template T2
+ * @template T
  *
- * @implements AsyncHandlerInterface<T1>
+ * @implements AsyncHandlerInterface<T>
  */
 final class BatchAsyncHandler implements BatchHandlerInterface, AsyncHandlerInterface
 {
     use BatchHandlerTrait;
 
     /**
-     * @var AsyncHandlerInterface<T2>
+     * @var AsyncHandlerInterface<T>
      */
     private AsyncHandlerInterface $asyncHandler;
 
     /**
-     * @param null|AsyncHandlerInterface<T2> $asyncHandler
+     * @param null|AsyncHandlerInterface<T> $asyncHandler
      */
     public function __construct(
         private int $batchSize = 10,
@@ -41,6 +41,7 @@ public static function getSubscribedEvents()
     {
         return [
             Event::ASYNC => 'async',
+            Event::POOL => 'pool',
         ];
     }
 
@@ -53,12 +54,17 @@ public function async(AsyncEvent $event): void
         $this->handle($event, $ack);
     }
 
+    public function pool(PoolEvent $event): void
+    {
+        $this->asyncHandler->pool($event);
+    }
+
     /**
      * PHPStan should normaly pass for method.unused
      * https://github.com/phpstan/phpstan/issues/6039
      * https://phpstan.org/r/8f7de023-9888-4dcb-b12c-e2fcf9547b6c.
      *
-     * @param array{0: AsyncEvent<T1>, 1: Acknowledger}[] $jobs
+     * @param array{0: AsyncEvent<T>, 1: Acknowledger}[] $jobs
      *
      * @phpstan-ignore method.unused
      */
diff --git a/src/AsyncHandler/DeferAsyncHandler.php b/src/AsyncHandler/DeferAsyncHandler.php
index b36727a..3c0f1d9 100644
--- a/src/AsyncHandler/DeferAsyncHandler.php
+++ b/src/AsyncHandler/DeferAsyncHandler.php
@@ -7,6 +7,8 @@
 use Flow\AsyncHandlerInterface;
 use Flow\Event;
 use Flow\Event\AsyncEvent;
+use Flow\Event\PoolEvent;
+use Flow\IpPool;
 
 /**
  * @template T
@@ -15,10 +17,21 @@
  */
 final class DeferAsyncHandler implements AsyncHandlerInterface
 {
+    /**
+     * @var IpPool<T>
+     */
+    private IpPool $ipPool;
+
+    public function __construct()
+    {
+        $this->ipPool = new IpPool();
+    }
+
     public static function getSubscribedEvents()
     {
         return [
             Event::ASYNC => 'async',
+            Event::POOL => 'pool',
         ];
     }
 
@@ -26,11 +39,19 @@ public function async(AsyncEvent $event): void
     {
         $ip = $event->getIp();
         $job = $event->getJob();
+
+        $popIp = $this->ipPool->addIp($ip);
         $next = $job([$ip->data, $event->getDefer()]);
-        $next(static function ($result) use ($event) {
+        $next(static function ($result) use ($event, $popIp) {
             [$data] = $result;
             $callback = $event->getCallback();
             $callback($data);
+            $popIp();
         });
     }
+
+    public function pool(PoolEvent $event): void
+    {
+        $event->addIps($this->ipPool->getIps());
+    }
 }
diff --git a/src/AsyncHandlerInterface.php b/src/AsyncHandlerInterface.php
index c66ce8d..01a6a1f 100644
--- a/src/AsyncHandlerInterface.php
+++ b/src/AsyncHandlerInterface.php
@@ -5,6 +5,7 @@
 namespace Flow;
 
 use Flow\Event\AsyncEvent;
+use Flow\Event\PoolEvent;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 
 /**
@@ -16,4 +17,9 @@ interface AsyncHandlerInterface extends EventSubscriberInterface
      * @param AsyncEvent<T> $event
      */
     public function async(AsyncEvent $event): void;
+
+    /**
+     * @param PoolEvent<T> $event
+     */
+    public function pool(PoolEvent $event): void;
 }
diff --git a/src/Driver/AmpDriver.php b/src/Driver/AmpDriver.php
index c4b95b4..89d732b 100644
--- a/src/Driver/AmpDriver.php
+++ b/src/Driver/AmpDriver.php
@@ -34,6 +34,8 @@
  */
 class AmpDriver implements DriverInterface
 {
+    use DriverTrait;
+
     private int $ticks = 0;
 
     public function __construct(?Driver $driver = null)
@@ -121,18 +123,16 @@ public function await(array &$stream): void
                                 $stream['fnFlows'][$index]['errorJob']($data);
                             } elseif (array_key_exists($index + 1, $stream['fnFlows'])) {
                                 $ip = new Ip($data);
-                                $stream['ips']++;
                                 $stream['dispatchers'][$index + 1]->dispatch(new PushEvent($ip), Event::PUSH);
                             }
 
                             $stream['dispatchers'][$index]->dispatch(new PopEvent($nextIp), Event::POP);
-                            $stream['ips']--;
                         }), Event::ASYNC);
                     }
                 }
             } while ($nextIp !== null);
 
-            if ($stream['ips'] > 0 or $this->ticks > 0) {
+            if ($this->countIps($stream['dispatchers']) > 0 or $this->ticks > 0) {
                 EventLoop::defer($loop);
             } else {
                 EventLoop::getDriver()->stop();
diff --git a/src/Driver/DriverTrait.php b/src/Driver/DriverTrait.php
new file mode 100644
index 0000000..ee4c223
--- /dev/null
+++ b/src/Driver/DriverTrait.php
@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\Driver;
+
+use Flow\Event;
+use Flow\Event\PoolEvent;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+
+use function count;
+
+trait DriverTrait
+{
+    /**
+     * @param array<EventDispatcherInterface> $dispatchers
+     */
+    public function countIps(array $dispatchers): int
+    {
+        $count = 0;
+        foreach ($dispatchers as $dispatcher) {
+            $count += count($dispatcher->dispatch(new PoolEvent(), Event::POOL)->getIps());
+        }
+
+        return $count;
+    }
+}
diff --git a/src/Driver/FiberDriver.php b/src/Driver/FiberDriver.php
index 451297f..1706ba0 100644
--- a/src/Driver/FiberDriver.php
+++ b/src/Driver/FiberDriver.php
@@ -30,6 +30,8 @@
  */
 class FiberDriver implements DriverInterface
 {
+    use DriverTrait;
+
     /**
      * @var array<mixed>
      */
@@ -121,7 +123,7 @@ public function await(array &$stream): void
 
         $tick = 0;
         $fiberDatas = [];
-        while ($stream['ips'] > 0 or count($this->ticks) > 0) {
+        do {
             foreach ($this->ticks as [
                 'interval' => $interval,
                 'callback' => $callback,
@@ -136,6 +138,7 @@ public function await(array &$stream): void
             do {
                 foreach ($stream['dispatchers'] as $index => $dispatcher) {
                     $nextIp = $dispatcher->dispatch(new PullEvent(), Event::PULL)->getIp();
+
                     if ($nextIp !== null) {
                         $stream['dispatchers'][$index]->dispatch(new AsyncEvent(static function (Closure|JobInterface $job) use ($async) {
                             return $async(false)($job);
@@ -146,12 +149,10 @@ public function await(array &$stream): void
                                 $stream['fnFlows'][$index]['errorJob']($data);
                             } elseif (array_key_exists($index + 1, $stream['fnFlows'])) {
                                 $ip = new Ip($data);
-                                $stream['ips']++;
                                 $stream['dispatchers'][$index + 1]->dispatch(new PushEvent($ip), Event::PUSH);
                             }
 
                             $stream['dispatchers'][$index]->dispatch(new PopEvent($nextIp), Event::POP);
-                            $stream['ips']--;
                         }), Event::ASYNC);
                     }
                 }
@@ -168,7 +169,7 @@ public function await(array &$stream): void
             }
 
             $tick++;
-        }
+        } while ($this->countIps($stream['dispatchers']) > 0 or count($this->ticks) > 0);
     }
 
     public function delay(float $seconds): void
diff --git a/src/Driver/ReactDriver.php b/src/Driver/ReactDriver.php
index 0d01656..2225079 100644
--- a/src/Driver/ReactDriver.php
+++ b/src/Driver/ReactDriver.php
@@ -34,6 +34,8 @@
  */
 class ReactDriver implements DriverInterface
 {
+    use DriverTrait;
+
     private int $ticks = 0;
 
     private LoopInterface $eventLoop;
@@ -114,18 +116,16 @@ public function await(array &$stream): void
                                 $stream['fnFlows'][$index]['errorJob']($data);
                             } elseif (array_key_exists($index + 1, $stream['fnFlows'])) {
                                 $ip = new Ip($data);
-                                $stream['ips']++;
                                 $stream['dispatchers'][$index + 1]->dispatch(new PushEvent($ip), Event::PUSH);
                             }
 
                             $stream['dispatchers'][$index]->dispatch(new PopEvent($nextIp), Event::POP);
-                            $stream['ips']--;
                         }), Event::ASYNC);
                     }
                 }
             } while ($nextIp !== null);
 
-            if ($stream['ips'] > 0 or $this->ticks > 0) {
+            if ($this->countIps($stream['dispatchers']) > 0 or $this->ticks > 0) {
                 $this->eventLoop->futureTick($loop);
             } else {
                 $this->eventLoop->stop();
diff --git a/src/Driver/SpatieDriver.php b/src/Driver/SpatieDriver.php
index b008e5d..80a4503 100644
--- a/src/Driver/SpatieDriver.php
+++ b/src/Driver/SpatieDriver.php
@@ -30,6 +30,8 @@
  */
 class SpatieDriver implements DriverInterface
 {
+    use DriverTrait;
+
     private int $ticks = 0;
 
     private Pool $pool;
@@ -89,7 +91,7 @@ public function await(array &$stream): void
         };
 
         $nextIp = null;
-        while ($stream['ips'] > 0 or $this->ticks > 0) {
+        do {
             do {
                 foreach ($stream['dispatchers'] as $index => $dispatcher) {
                     $nextIp = $dispatcher->dispatch(new PullEvent(), Event::PULL)->getIp();
@@ -99,17 +101,15 @@ public function await(array &$stream): void
                                 $stream['fnFlows'][$index]['errorJob']($data);
                             } elseif (array_key_exists($index + 1, $stream['fnFlows'])) {
                                 $ip = new Ip($data);
-                                $stream['ips']++;
                                 $stream['dispatchers'][$index + 1]->dispatch(new PushEvent($ip), Event::PUSH);
                             }
 
                             $stream['dispatchers'][$index]->dispatch(new PopEvent($nextIp), Event::POP);
-                            $stream['ips']--;
                         }), Event::ASYNC);
                     }
                 }
             } while ($nextIp !== null);
-        }
+        } while ($this->countIps($stream['dispatchers']) > 0 or $this->ticks > 0);
     }
 
     public function delay(float $seconds): void
diff --git a/src/Driver/SwooleDriver.php b/src/Driver/SwooleDriver.php
index 413c99d..2c6e9e9 100644
--- a/src/Driver/SwooleDriver.php
+++ b/src/Driver/SwooleDriver.php
@@ -30,6 +30,8 @@
  */
 class SwooleDriver implements DriverInterface
 {
+    use DriverTrait;
+
     private int $ticks = 0;
 
     public function __construct()
@@ -85,7 +87,7 @@ public function await(array &$stream): void
         };
 
         co::run(function () use (&$stream, $async, $defer) {
-            while ($stream['ips'] > 0 or $this->ticks > 0) {
+            do {
                 $nextIp = null;
                 do {
                     foreach ($stream['dispatchers'] as $index => $dispatcher) {
@@ -96,18 +98,16 @@ public function await(array &$stream): void
                                     $stream['fnFlows'][$index]['errorJob']($data);
                                 } elseif (array_key_exists($index + 1, $stream['fnFlows'])) {
                                     $ip = new Ip($data);
-                                    $stream['ips']++;
                                     $stream['dispatchers'][$index + 1]->dispatch(new PushEvent($ip), Event::PUSH);
                                 }
 
                                 $stream['dispatchers'][$index]->dispatch(new PopEvent($nextIp), Event::POP);
-                                $stream['ips']--;
                             }), Event::ASYNC);
                         }
                     }
                     co::sleep(1);
                 } while ($nextIp !== null);
-            }
+            } while ($this->countIps($stream['dispatchers']) > 0 or $this->ticks > 0);
         });
     }
 
diff --git a/src/DriverInterface.php b/src/DriverInterface.php
index 69a588b..c33d16a 100644
--- a/src/DriverInterface.php
+++ b/src/DriverInterface.php
@@ -30,7 +30,7 @@ public function async(Closure|JobInterface $callback): Closure;
     public function defer(Closure $callback): mixed;
 
     /**
-     * @param array{'ips': int, 'fnFlows': array<mixed>, 'dispatchers': array<mixed>} $stream
+     * @param array{'fnFlows': array<mixed>, 'dispatchers': array<mixed>} $stream
      */
     public function await(array &$stream): void;
 
diff --git a/src/Event.php b/src/Event.php
index c8a8a02..fa1515f 100644
--- a/src/Event.php
+++ b/src/Event.php
@@ -41,4 +41,13 @@ final class Event
      * @Event("Flow\Event\PopEvent")
      */
     public const POP = 'pop';
+
+    /**
+     * The POOL event occurs when Flow need to get the pool IPs to process.
+     *
+     * This event allows you to get the pool IPs to process.
+     *
+     * @Event("Flow\Event\PoolEvent")
+     */
+    public const POOL = 'pool';
 }
diff --git a/src/Event/PoolEvent.php b/src/Event/PoolEvent.php
new file mode 100644
index 0000000..bedf786
--- /dev/null
+++ b/src/Event/PoolEvent.php
@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\Event;
+
+use Flow\Ip;
+use Flow\IpPool;
+use Symfony\Contracts\EventDispatcher\Event;
+
+/**
+ * @template T
+ */
+final class PoolEvent extends Event
+{
+    /**
+     * @var IpPool<T>
+     */
+    private IpPool $ipPool;
+
+    public function __construct()
+    {
+        $this->ipPool = new IpPool();
+    }
+
+    /**
+     * @param array<Ip<T>> $ips
+     */
+    public function addIps(array $ips): void
+    {
+        foreach ($ips as $ip) {
+            $this->ipPool->addIp($ip);
+        }
+    }
+
+    /**
+     * @return array<Ip<T>>
+     */
+    public function getIps(): array
+    {
+        return $this->ipPool->getIps();
+    }
+}
diff --git a/src/Flow/Flow.php b/src/Flow/Flow.php
index 511bd24..a5f588f 100644
--- a/src/Flow/Flow.php
+++ b/src/Flow/Flow.php
@@ -37,7 +37,6 @@ class Flow implements FlowInterface
      * @var array<mixed>
      */
     private array $stream = [
-        'ips' => 0,
         'fnFlows' => [],
         'dispatchers' => [],
     ];
@@ -89,7 +88,6 @@ public function __construct(
 
     public function __invoke(Ip $ip): void
     {
-        $this->stream['ips']++;
         $this->stream['dispatchers'][0]->dispatch(new PushEvent($ip), Event::PUSH);
     }
 
diff --git a/src/IpPool.php b/src/IpPool.php
new file mode 100644
index 0000000..db052a0
--- /dev/null
+++ b/src/IpPool.php
@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow;
+
+/**
+ * @template T
+ */
+class IpPool
+{
+    /**
+     * @var array<Ip<T>>
+     */
+    private array $ips = [];
+
+    /**
+     * @param Ip<T> $ip
+     *
+     * @return callable A function that removes the added IP from the pool when called
+     */
+    public function addIp(Ip $ip): callable
+    {
+        $this->ips[] = $ip;
+
+        return function () use ($ip) {
+            $this->ips = array_filter($this->ips, static function ($iteratorIp) use ($ip) {
+                return $iteratorIp !== $ip;
+            });
+        };
+    }
+
+    /**
+     * @return array<Ip<T>>
+     */
+    public function getIps(): array
+    {
+        return $this->ips;
+    }
+}
diff --git a/src/IpStrategy/LinearIpStrategy.php b/src/IpStrategy/LinearIpStrategy.php
index 775df2b..f965e5a 100644
--- a/src/IpStrategy/LinearIpStrategy.php
+++ b/src/IpStrategy/LinearIpStrategy.php
@@ -5,6 +5,7 @@
 namespace Flow\IpStrategy;
 
 use Flow\Event;
+use Flow\Event\PoolEvent;
 use Flow\Event\PullEvent;
 use Flow\Event\PushEvent;
 use Flow\Ip;
@@ -27,6 +28,7 @@ public static function getSubscribedEvents(): array
         return [
             Event::PUSH => 'push',
             Event::PULL => 'pull',
+            Event::POOL => 'pool',
         ];
     }
 
@@ -45,4 +47,9 @@ public function pull(PullEvent $event): void
     {
         $event->setIp(array_shift($this->ips));
     }
+
+    public function pool(PoolEvent $event): void
+    {
+        $event->addIps($this->ips);
+    }
 }
diff --git a/src/IpStrategy/MaxIpStrategy.php b/src/IpStrategy/MaxIpStrategy.php
index e323839..1eb9a4a 100644
--- a/src/IpStrategy/MaxIpStrategy.php
+++ b/src/IpStrategy/MaxIpStrategy.php
@@ -5,6 +5,7 @@
 namespace Flow\IpStrategy;
 
 use Flow\Event;
+use Flow\Event\PoolEvent;
 use Flow\Event\PopEvent;
 use Flow\Event\PullEvent;
 use Flow\Event\PushEvent;
@@ -47,6 +48,7 @@ public static function getSubscribedEvents()
             Event::PUSH => 'push',
             Event::PULL => 'pull',
             Event::POP => 'pop',
+            Event::POOL => 'pool',
         ];
     }
 
@@ -67,9 +69,8 @@ public function pull(PullEvent $event): void
             $ip = $this->dispatcher->dispatch($event, Event::PULL)->getIp();
             if ($ip) {
                 $this->processing++;
+                $event->setIp($ip);
             }
-
-            $event->setIp($ip);
         }
     }
 
@@ -81,4 +82,9 @@ public function pop(PopEvent $event): void
         $this->dispatcher->dispatch($event, Event::POP);
         $this->processing--;
     }
+
+    public function pool(PoolEvent $event): void
+    {
+        $event->addIps($this->dispatcher->dispatch($event, Event::POOL)->getIps());
+    }
 }
diff --git a/src/IpStrategy/StackIpStrategy.php b/src/IpStrategy/StackIpStrategy.php
index af2c506..09c2357 100644
--- a/src/IpStrategy/StackIpStrategy.php
+++ b/src/IpStrategy/StackIpStrategy.php
@@ -5,6 +5,7 @@
 namespace Flow\IpStrategy;
 
 use Flow\Event;
+use Flow\Event\PoolEvent;
 use Flow\Event\PullEvent;
 use Flow\Event\PushEvent;
 use Flow\Ip;
@@ -27,6 +28,7 @@ public static function getSubscribedEvents()
         return [
             Event::PUSH => 'push',
             Event::PULL => 'pull',
+            Event::POOL => 'pool',
         ];
     }
 
@@ -45,4 +47,9 @@ public function pull(PullEvent $event): void
     {
         $event->setIp(array_pop($this->ips));
     }
+
+    public function pool(PoolEvent $event): void
+    {
+        $event->addIps($this->ips);
+    }
 }
diff --git a/src/IpStrategyInterface.php b/src/IpStrategyInterface.php
index 1953c28..13e106f 100644
--- a/src/IpStrategyInterface.php
+++ b/src/IpStrategyInterface.php
@@ -4,9 +4,16 @@
 
 namespace Flow;
 
+use Flow\Event\PoolEvent;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 
 /**
  * @template T
  */
-interface IpStrategyInterface extends EventSubscriberInterface {}
+interface IpStrategyInterface extends EventSubscriberInterface
+{
+    /**
+     * @param PoolEvent<T> $event
+     */
+    public function pool(PoolEvent $event): void;
+}