How do I know if my aquarium's UV sterilizer is still working?

On this blog, we haven't yet addressed the issue of aquarium UV sterilizers. This tool makes it possible to treat harmful floating microscopic organisms, such as bacteria, viruses, or even residual algae. How it works is very simple.

The sterilizer emits very high-intensity ultraviolet light. But... how do I know if my aquarium's UV sterilizer is still working?

When should you turn on an aquarium UV sterilizer?

To maintain a completely sanitized environment, this tool should run 24/7. That said, this rule applies except in a few exceptional cases. During setup (before there are any fish in the aquarium), you will likely be adding beneficial bacteria to your aquarium water. At that specific time, keep your UV sterilizer turned off, as UV light kills bacteria.

Furthermore, some aquarists turn their UV sterilizers on intermittently to allow phytoplankton and zooplankton to feed. However, this also allows parasites to do the same. It is therefore illogical to turn your UV sterilizer on every other day. If you have installed a UV sterilizer, it is to protect your fish from parasites at all times.

How do I know if my aquarium's UV sterilizer is still working?

If you install a UV sterilizer in your aquarium, be sure to note the installation date somewhere. A useful technique is to write the date on the box and keep it safely in the attic or basement. By doing this, you will know when to change your UV sterilizer. In fact, bulbs must be changed every 6 to 12 months, depending on the bulb brand and manufacturer's recommendations. And to know when to change the sterilizer, don't hesitate to test your water to check its parameters: pH, kH, nitrites, nitrates, phosphates, oxygen, etc.

Some garden centers and aquarists systematically change their UV sterilizers every six months to ensure they are always operating optimally.

When replacing a bulb, also remember to clean the inside of the quartz tube every year, as it acts as a transparent barrier between the light and the water, and if it is covered in limescale or dirt, the light cannot penetrate as effectively.

How to clean a UV sterilizer?

Every time you change the bulb, you should spend a few minutes cleaning the sterilizer. To do this, disassemble the device, remove the bulb, and take out the foam filter to clean it thoroughly. Then, wash the inside of your UV sterilizer. Finally, add a brand-new UV bulb before reassembling the kit.

How to choose an aquarium UV sterilizer?

A UV sterilizer clarifies the water color and reduces suspended pathogens. To choose one, ensure that the reservoir's technical specifications are compatible with saltwater or freshwater use, depending on the type of water in your aquarium. As a general rule, they are all compatible with freshwater, but not necessarily with saltwater.

Additionally, check that the flow rate and power of your sterilizer are sufficient. The higher the energy rating of your sterilizer, the more capable the device will be of killing germs at the DNA level. The flow rate must be proportional to the size of the tank.

Here are some examples of effective UV sterilizers for aquariums:

• OASE UV CLEARTRONIC (the "Rolls-Royce" of aquarium UVs)
• SERA UV Algovec
• JBL - AquaCristal UV-C;

And now, you know everything about the operation and maintenance of your UV sterilizer!

Just like the rest of the elements in your aquarium (accessories, filtration system, substrate), it is crucial to take care of your UV sterilizer. After all, it is what improves the well-being of your fish population and helps your aquarium water stay clear! Is your aquarium water turning green? Quickly discover our article dedicated to this topic.