A gravity-fed filtration system interconnection structure comprising a reservoir for receiving ingress fluid, and a second, dispensing reservoir. A carrier or shuttle having a carrier magnet is connected to a sluice gate valve which normally blocks the opening to the second reservoir. A filter cartridge may be received by the reservoir and includes a housing body, and a filter magnet disposed within or fixedly connected to the housing body. The filter magnet and the carrier magnet are interconnected via magnetic communication upon insertion of the filter cartridge into the reservoir recess, to move the carrier and/or sluice gate valve as a result of shear force or rotational force generated between the magnets.