AA Aquarium Green Killing Machine 9 Watt | Internal UV Sterilizer System with Power Head | Kills Algae, Bacteria, and Waterborne Pathogens | Easy, Submersible Installation Say GOODBYE to GREEN and HELLO to CLEAN. AA Aquariums Green Killing Machine eliminates cloudiness, algae & bacteria to give your fish the crystal clear water they need for perfect health! The #1 UV in the US  over  Million sold. Patented technology that no one else has and the ONLY UL Safety Tested internal UV kit  Be safe with your tank and fish! Patented Sealed UV BULB - you never touch glass! Chambered bulb assembly for high water dwell time and outstanding efficacy! No gloves-No mess-EZ bulb changes! NO TOOLS REQUIRED! 10 minute installation - Follow simple steps to get clear water in days. No Guessing  Control Box LED tells you when to change bulbs! 3 Year Warranty on Pump; 4 pcs sponge pre-filter; Pump rated 220L/Hour. Perfect for aquariums up to 50 Gallons (210 L). UL/cUL Listed