Green Killing Machine 9W - 50 Gal Internal UV Sterilizer Zigzag Flow Fresh & Saltwater - Aqua-Fit

The Aqua-Fit by AA Aquarium Green Killing Machine (GKM) 9W is a submersible internal UV-C sterilizer for freshwater and saltwater aquariums up to 50 gallons (200 liters). All-in-one system with integrated 50 GPH pump, sealed UV bulb, control box, and adapter — 5-minute installation with no tools or plumbing required.

Green Killing Machine 9W Benefits

• 9-watt 254nm UV-C radiation: eliminates suspended algae, bacteria, yeasts, molds, and pathogens
• Patented Zigzag Flow design inside the housing to maximize UV light exposure time
• Integrated 50 GPH pump with reduced flow inside the bulb (37 GPH) for effective sterilization
• Helps combat cyanobacteria, dinoflagellates, ich, and velvet in both fresh and saltwater
• ChildSafe 12V DC power supply — safe for fish, plants, and invertebrates
• LED indicator on the control box signals when to replace the UV bulb
• UL and cUL certified — the only Underwriters Laboratories certified internal UV sterilizer

Installation and Use

The GKM 9W attaches inside the aquarium with suction cups and can be positioned vertically, horizontally, or in a filtration sump. Assembled dimensions: 4" x 4" x 12". The control box must remain outside the aquarium. For optimal results, run 24/7 for the first 2 weeks, then connect to a timer (8 hours per day) to extend bulb life. Do not use simultaneously with medications — UV neutralizes chemical treatments.

Technical Specifications

• UV-C Power: 9 watts at 254 nm
• Power Supply: 12V DC
• Pump Flow Rate: 50 GPH (flow rate inside the bulb: 37 GPH)
• Capacity: aquariums up to 50 gallons (200 liters)
• Compatibility: freshwater and saltwater
• Assembled Dimensions: 4" x 4" x 12"
• Double Pin Connector
• Bulb Lifespan: 6 to 9 months (continuous use)
• Included: 50 GPH submersible pump, sealed UV bulb, control box, DC adapter, filter sponge, suction cups
• Warranty: 1 year against defects in materials and workmanship (UV-C bulb excluded)
• Certifications: UL, cUL — EPA Est. #093568

Available Sizes — Green Killing Machine

• Mini GKM 3W — aquariums up to 20 gal (80 L)
• GKM 9W — aquariums up to 50 gal (200 L)
• GKM 24W — aquariums up to 120 gal (450 L)

Why choose this product from ReefSolution

The Green Killing Machine 9W is the most popular model in the range — ideal for medium-sized aquariums. Complement your system with the Green Killing Machine Mini 3W for a nano-aquarium, the Green Killing Machine 24W for aquariums over 50 gallons, a Seachem Purigen for organic chemical filtration, or a Seachem Clarity to quickly eliminate turbidity.

Frequently Asked Questions

Can the Green Killing Machine 9W be installed in a sump?

Yes, the GKM 9W can be placed vertically, horizontally, or directly in a filtration sump. Ideal for reef systems where the aesthetics of the main aquarium are important.

What is the actual flow rate of the Green Killing Machine 9W for UV sterilization?

The pump delivers 50 GPH, but the Zigzag Flow design reduces the flow to 37 GPH inside the bulb to maximize UV-C contact time and ensure effective sterilization.

Is the Green Killing Machine 9W sufficient for a 55-gallon aquarium?

The GKM 9W is designed for aquariums up to 50 gallons. For a 55-gallon tank, it can work but the treatment will be slower. For optimal efficiency on aquariums over 50 gallons, consider the GKM 24W.