Swim Stim Red Krill Groundbait combines Koi technology which has been developed to attract and hold carp in your swim without over feeding them. With the addition of red krill, a carp attractant favoured by the top UK carp anglers, this groundbait has proved irresistible to all carp. Swim Stim Red Krill has been designed to be effective when fishing for carp in all waters and conditions.