Green Killing Machine

Green Killing Machine is a family of internal UV sterilizers developed by AA Aquarium rather than an independent company. AA Aquarium traces its own origin to 1982, when Sealand Holdings Co., Ltd. established the brand; that date belongs to the parent structure and does not document the specific launch of GKM.

GKM devices combine an ultraviolet lamp with a small pump and internal water path to address green water and suspended cloudiness. The line focuses on compact units installed directly in the tank, with replaceable lamps or cartridges and spare parts sold through the official store.

AA Aquarium Inc. operates the US shop, while Sealand Holdings Co., Ltd. is identified as a Hong Kong associate handling some payments. The store provides a US postal return address but does not describe it as headquarters, and GKM remains commercially integrated within the wider AA Aquarium portfolio. The brand presents the product as a targeted solution rather than extending into a complete external-filtration system or a general aquarium line.