Use this special formula when you know that sharks will be biting at the surface. This compound affects the shark's sense of taste and is highly repellent, but it must contact their mouth. This is one (1) can, totalling 5.2 fl. oz. in a manually-activated repellent canister. Specially-weighted can will initially sink and then rise to the surface as repellent is released, creating a total 150mL surface cloud of gustation repellent (affects shark's sense of taste). During testing, bait was protected for 15 minutes after repellent was released. We based this repellent technology on the work that SharkDefense did with the Nurse Bite Kit and other experiments where sharks rejected bait.