Aqua Ultraviolet

25 Watt Classic UV Sterilizer - Black Body

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Effective Water Clarification & Sterilization

  • Easily Achieve Crystal Clear Water
  • Will Not Alter Water Chemistry
  • Quick and Easy Quartz Sleeve Maintenance
  • Quick Release Unions
  • Available in Black or White


Aqua Ultraviolet is one of the most popular options available and has been in the UV game for more than four decades creating UV sterilizers for use across multiple industries including aquaculture and food & beverage on the commercial side to aquariums and ponds for home use. They're simple in construction, well built, and they're made in the USA. 


How UV Sterilizers Work

Ultraviolet sterilizers are a time-tested approach to water clarification and sterilization. They emit a germicidal UV-C ray that will alter the DNA or RNA of single celled organisms like algae, bacteria, and protozoa, rendering them unable to reproduce. The result is crystal clear water without the use of any chemicals. Using a UV sterilizer will not alter water chemistry. 

Aqua Ultraviolet sterilizers include a clear-blue cap that lets you see when the lamp is powered on, without having to risk any exposure to the harmful UV-C rays. How effective the UV sterilizer is greatly depends on having the proper flow rate through the sterilizer body, so we highly suggest using a valve or a DC pump to control the flow through the UV sterilizer. For freshwater aquariums, AquaUV suggests 1200 gallons per hour for the 25 Watt Classic UV Sterilizer. 



Over time the efficiency of the sterilizer will start to diminish because the lamp is no longer putting out the same amount of energy, but also the quartz sleeve that houses the lamp can become coated with mineral deposits and start to become cloudy. We suggest cleaning the quartz sleeve a few times each year and replacing the UV lamp annually. This AquaUV Sterilizer includes quick-connect unions on the input and output allowing you to quickly remove the entire system from your aquariums plumbing for maintenance. With proper maintenance, your UV sterilizer will work like it did from day one.



Dimensions - 20" L x 3.75" W x 6" H

Input Size - 3/4" Barb

Output Size - 3/4" Barb

Power Consumption - 25 Watts

Wall Outlet to Transformer Cord Length - 15 Foot

Transformer to Lamp Connector Length - 32"


Aquarium Size Recommendations: 

Freshwater Sterilizer: Up to 1200 Gallons

Freshwater Clarifier: Up to 4000 Gallons

Flow Rate: 1200 GPH


What's Included?

25-Watt Classic UV Sterilizer

25-Watt Classic Power Transformer

25-Watt UV Lamp

2x 3/4" Barb Fittings

More Information
UPC 617750000237
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Product Questions

how will this 25w fair with a 180G reef tank? It says 150 but what about 180?

The size is good, not too big. The other ones are way too big...
Question by: Tony on Dec 11, 2023, 10:23 AM
Hey there,
Thank you for reaching out to us. You are correct. The next model up is much bigger and over anything you need. I think the 25 watt will be sufficient for that extra 30 gallons. . Please let me know if you need anything further.
Answer by: Thomas Wofle (BRS Staff) on Feb 7, 2024, 11:01 AM
Does this come with a mounting brackets to mount it on side of the tank?
Question by: Landon Pinnick on Feb 27, 2023, 9:53 AM
I have a 150 gallon saltwater with dinoflagellates. Will the 25 watt UV sterilizer be enough, or should I go to a higher wattage bulb? Will it be too much if I buy the 57 watt UV sterilizer instead?
Question by: RANDALL VANGIESSEN on Jul 16, 2022, 6:57 PM
Thanks for the question! The 25 watt should work for your tank as by time you factor in displacement of rock, sand, and coral, the volume may be just below 150 gallons. Let us know if we can help with anything else!
Answer by: Kyle Thomas (BRS Staff) on Jul 19, 2022, 11:02 AM
What gph would I need to run this at for a 100 gallon tank. For Algea or parasites
Question by: Chris Roberts on May 19, 2022, 4:02 PM
The AquaUV 25 Watt sterilizer (https://www.bulkreefsupply.com/25-watt-classic-uv-sterilizer-black-body-aqua-ultraviolet.html) should have a flow rate of approximately 400 gallons per hour to address any algal cells or protozoa bacteria. For a standard reef aquarium, the sterilizer can run between 800 and 1200 gallons per hour.
Answer by: Scott F. (BRS Staff) on May 19, 2022, 5:39 PM
If I want to hard plumb this instead of tubing, what would I need?
Question by: Jerome Hollon on Nov 25, 2021, 7:11 PM
Hello, thank you for the question. This unit comes with 2" Inlet and 2" Outlet PVC fittings, you can purchase separately any Bushing Fittings to reduce the PVC from 2" to 3/4" PVC. Happy Reef Keeping
Answer by: Christian (BRS Staff) on Nov 28, 2021, 12:50 PM
Other than a pump and mounting clamps, is there anything else that I will need to set this up?
Thanks in advance
Question by: William Bowers on Sep 5, 2020, 11:03 AM
Hey there,
Thank you for reaching out to us! You will also need tubing.

Please let me know if you need anything further and take care!
Answer by: Matt Lucero on Sep 9, 2020, 9:18 AM
What size clamp do I need to buy for this UV (25watt version) to mount in a cabinet ?
Question by: Pankaj Khetarpal on Apr 8, 2020, 9:57 AM
Hello Pankaj ,

The body of the 25 watt UV is 2" PVC so you will want to use the 2" surface mount clamp. The product SKU is 208418 on the page linked below.


Happy Reefing!
Answer by: Nick on Apr 13, 2020, 12:43 PM