What is a UV Sterilizer?

A UV sterilizer, also known as a UV clarifier, is a device that uses ultraviolet (UV) light to sterilize aquarium water. It works by passing the water through a chamber that contains a UV lamp, which emits UV light at a specific wavelength. As the water passes through the chamber, the UV light kills or inactivates microorganisms such as bacteria, viruses, and algae spores, which are present in the water.


UV sterilizers are used in aquariums as a way to improve water quality, control algae growth and reduce the overall bioload in the aquarium. They are typically used in conjunction with other filtration methods, such as mechanical and biological filters, and can provide an additional level of filtration and water purification.

There are two main types of UV sterilizers: low-pressure and high-pressure sterilizers. Low-pressure sterilizers use a low-pressure UV lamp that emits UV light at a lower intensity, making them suitable for smaller aquariums or for use as a supplementary filtration method in larger aquariums. High-pressure sterilizers use a high-pressure UV lamp that emits UV light at a higher intensity and have a higher efficacy rate, making them more suitable for larger aquariums or for more demanding applications like commercial use or large ponds.

UV sterilizers are not a substitute for regular water changes and maintenance, they are an additional tool to help maintain the water quality in an aquarium. It is also important to regularly replace UV bulbs, as they lose their effectiveness over time. Also, proper installation and use of UV sterilizers are crucial for their effectiveness, proper flow rate and duration of exposure to the UV light is important for the sterilization process.