10 Best Uv Sterilizer Freshwater Aquarium of December 2025

• Turns green water to clear in 3 to 7 days by killing the floating a-lgae
• Suitable for Saltwater and Freshwater
• Clean up to 75 gallons tank
• Built in 5 watt water pump
• 5 Watt U-V bulb included

COODIA

• 2 in 1 Functions: Not just a hang on filter but also a green water killer.
• Activated carbon cartridge removes harmful chemicals, toxins, odors, and other contaminants for your aquarium.
• Green water killer: An individual U.V bulb installed inside kills the green floating a-lgae turning the water from green to clear.
• Adjustable flow knob allows you to adjust the flow rate as needed. Suitable or both freshwater and saltwater applications.
• Ultra Quiet: Comes with a low-energy and waterproof motor, which is quiet can work continuously with no rest, it will not affect your sleep while in operation.

COODIA

• 💧UNIQUE 360° WATER NOZZLE: Unique 360-degree rotating body design for water inlet and outlet, provides the ideal water direction. The strong UV light, effectively purifies water.
• 💧HIGH EFFICIENCY: Flow Rate: 1585-2113GPH (6000-8000L/H). Use 253.7mm UV light source, it is efficiently purity the water in aquariums and ponds, the excellent effect, achieving clear water for your pet fish.
• 💧DURABLE MATERIAL: Made of high-quality quartz glass, transparent for UV light source is 99%, service life up to 5000 hours, 100% waterproof; water nozzle can 360-degree rotate; it is convenient and can satisfy every need for you.
• 💧EASY INSTALLATION: This 18W UV light must be external use, it can not be placed into the water. When using vertically, we must make sure the installation method of water inlet and outlet. It also can assemble 2 PCS. Perfect for fish tank, aquarium, ponds, freshwater and saltwater.
• 💧1-YEAR WARRANTY: We offer a 1-year limited warranty, you can buy confidence. If there is any quality issue, or you are not satisfied with our product, please kindly contact us first, we will respond to you within 24 hours.

Periha

• Suitable for Saltwater and Freshwater
• Clean up to 150 gallons tank
• Built in 8 watt water pump
• 13 Watt UV light included
• Comes with an optional adjustable water flow regulating nozzle. Dimension: 3" x 2. 5" x 13. 5" (H), Recommend for 40-75 gallon tank.

SunSun

• Advanced filtration system for larger aquariums (up to 90 gallons)
• Processes waste and impurities to keep aquarium water crystal clear and tank inhabitants healthy
• 18-watt UV (ultraviolet) sterilizer effectively removes unsightly green water and aids in removing harmful parasites
• Flow rate of 490 gallons per hour (GPH)
• Suitable for freshwater or saltwater aquariums

KollerCraft

• Say GOODBYE to GREEN and HELLO to CLEAN. AA Aquarium’s 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 ½ 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! Plug and Play! 2 minute installation - Have clear water in days. No Guessing – Control Switch LED tells you when to change bulbs!
• 3 Year Warranty on Pump; Pump rated 150 L/Hour. Perfect for aquariums up to 20 Gallons (85 L). UL/cUL Listed

AA Aquarium

• Designed to remove unwanted free floating algae, parasites and bacteria
• Increased exposure to UV light from twist-flow design
• Mounting brackets included for hang on or in-line applications
• Indicator light lets you know when the sterilizer is operating
• Can be used with freshwater and saltwater aquariums
• Recommended for aquariums up to 500 gallons

Coralife

• Say GOODBYE to GREEN and HELLO to CLEAN. AA Aquarium’s 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 ½ 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

AA Aquarium

• 【 Important Note 】After receiving the product, must remove the shock-proof sponge inside the product before using it. (For detailed steps, please see the third product picture in this product page)
• 【 Warm Prompt 】Because this product contains a small motor inside, used to drive water circulation, so when it without water to work, it will make a loud motor empty work sound, but as soon as it is put into water, the sound will disappear.In addition, in order to ensure the machine have best performance, we have checked all the mahine (in water) before shipment, so after receive the machine, it may be wet inside, please do not worry, it is brand new.
• 【4 Function in 1 Machine】water pump(adjustable) + air pump + filter + Clean, can directly use in the fish tank, No other connection requirements. 【 Product Size 】: 12" L X 3.3" W X 3.75" H, Cord: 4.6ft. Flow rate: 210 gallon per hour, suitable for tanks up to 80-gallons.
• 【Warm Tips:】 in order to maintain the best cleaning effect, recommended to inspect the machine every 1-2 weeks: open the out casing, 1. clean filter sponge, 2. check whether bulb work well, 3. check whether have water entered the quartz glass cover, due to the bulb generates heat during operation, it may cause slight water in to the quartz glass cover after a long time. if there is a slight Water into the glass cover (without affecting the bulb), just drain the water is OK)
• 【 1 Year Warranty】If any question or problems, please contact the service emailbox on the package, we will solve and reply in 24 hours.

Coospider

• Eliminates algae and harmful organisms
• Includes 9W UV bulb
• Up to 55g aquarium
• For freshwater or saltwater setups
• External use only. Hose and pump not included.

Odyssea