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  • Keep your aquarium crystal clear

  • Eliminate cloudiness without any chemicals

Turn green water into Clear water in days with Green Killing Machine!

Ultraviolet germicidal irradiation (UVGI) is a proven method that uses short wavelength ultraviolet (UVC) light to kill or inactivate unwanted microorganisms. Many drinking water systems use this technology.


The Green Killing Machine (GKM) makes fighting green water easier as it is internal UV – that is, a UV system that you simply drop into your tank for a full UV protection.
UV radiation is effective in controlling free flowing bacteria, yeast, mold and other pathogens, in turn clearing up green water without any chemicals. In addition, the Green Killing Machine’s design allows it to be hidden behind ornaments or plants in your aquarium, eliminating potential leaks around your tank.


Other benefits of GKM by AA Aquarium:

  • 5-minute installation without any tools 

  • Our Sealed UV Bulb has water flow in direct contact with the UVC lamp for increased efficiency.

  • 4 sizes that fit most aquariums:  3 Watt internal, 3 Watt Clip-On (40~80L), 9 Watt (81~200L) & 24 Watt (201~450L). 

  • When choosing a UV sterilizer always chose a SAFETY TESTED UV Sterilizer. Water and electricity require great design. The Green Killing Machine is the ONLY Internal UV System that is safety certified by Underwriters Laboratories (UL). Other units have NO US safety certifications.  DON’T RISK HARM TO YOUR FISH – use a certified-safe GREEN KILLING MACHINE.

Which GKM?

Select GKM base on the size of your aquarium, we recommend:


  • GKM Clip-On 3W for tanks up to 80L running with a waterfall filter. 

  • Mini GKM 3W for tanks up to 80L.

  • GKM 9W for tanks up to 200L.

  • GKM 24W for tanks up to 450L. 


For more information, click on the icon below to visit our GKM website