The scene you are talking about was never in the film.
Another good choice by Gottlieb, imho! The more you think about it, it would be very odd if this scene was in the movie. It would seem unusual that landlubber Brody would even know what this stuff was, and simply unbelievable that he'd give a damn - after all that's happened and given his own son has been indirectly threatened - exactly how the voracious shark could be hunted or killed.