Aqua Ultraviolet UV Sterilizers will eradicate algae, bacteria, and protozoa without any harmful chemicals or additives! UV lamps emit a wavelength that will alter and disrupt the DNA or RNA of single-celled organisms. Combining the UV lamp into a large housing allows for maximum contact time with the lamp allowing the sterilizer to be much more efficient. By changing the flow rates through the body of the UV sterilizer lets you target the specific issue you may be having. Most reefers will report that their tanks water clears up overnight with others taking just a couple days, and as long as the UV is running, the water will stay crystal clear! Clear Blue Quartz Cap - Lets you see when the lamp is on Outlet Hook - Mounts onto the top edge of most standard aquariums 1/2" Barbed Inlet - Connect any 1/2" tubing for a simple implementation Durable Body - Designed to last longer than traditional UV sterilizers Advantage Series UV Quickly implement a UV onto almost any aquarium in minutes! The AquaUV Advantage series includes a hang-on-back style hanger that houses the output flow from the sterilizer, meaning you only need to plumb the input and the rest will be taken care of. They are great for quarantine tanks, nano and pico reefs, or even portable frag tanks for swaps and shows to ensure crystal clear water. Suggested Aquarium Sizes: Saltwater Sterilization - 75 gallons Freshwater Sterilization - up to 500 gallons Freshwater Clarification - up to 2000 gallons