Repel Sharks: Shark Deterrent Canister Shark Repellent - designed to reduce interactions with sharks - uses semiochemical developed by the world-renowned shark scientists Dr. Eric Stroud and Dr. Patrick Rice from the Shark Defense research group - The only scientifically proven chemical shark deterrent One-time use, shown to repel 15 sharks at one time! Not harmful to sharks or other marine life, does not affect bony fish (teleosts) Affects olfaction (smell) and gustation (taste) in a wide variety of shark species (including all species that commonly present a serious danger to humans) Fully recyclable steel can, Inverted Release/Manual Trigger, 120-150 psi