diff --git a/cv_bottle_detection/detector.py b/cv_bottle_detection/detector.py
index 20bb3a6..23fc8d3 100644
--- a/cv_bottle_detection/detector.py
+++ b/cv_bottle_detection/detector.py
@@ -281,7 +281,7 @@ def detect_bottles(self, img: np.array, _preproc: bool = True, _return_bboxes=Fa
             
             # opening
             kernel = np.ones((3, 3), np.uint8)
-            dst = cv2.morphologyEx(dst, cv2.MORPH_OPEN, kernel, iterations=10)
+            dst = cv2.morphologyEx(dst, cv2.MORPH_OPEN, kernel, iterations=18)
             
             img = dst