How to change the UV lamp in your spa

Many, but not all spas, come with UV sterilization systems.

UV systems in spas can kill 99.9% of water borne viruses and bacteria, including the real tough bad guys like Giardia and Crypto sporidium viruses.

This helps to keep water crystal clear while reducing the amount of spa chemicals used.

As with most things UV sanitiser systems may require maintenance from time to time to keep benefiting from their advantages.


Typically there is one only thing that goes wrong with UV systems and that is the Ultraviolet Lamp.


No lamp (bulb) lasts forever and UV bulbs are no different. Eventually UV bulbs will exceed their life span and go dark at which time the sanitising effect stops and chemical usage increases in an attempt to maintain clear water.

With most systems, failure of the ultraviolet lamp will be indicated by shrill whistle coming from under your spa. This is your indication that it is time to replace your UV lamp. Once you open the cover to your spa you may find an additional indicator light.

Watch this short video showing the process of changing the UV bulb:



Buy a replacement UV lamp here.

The science behind UV sanatisers:

Ultraviolet(UV) spa sanitisers deploy a non-chemical process that uses germicidal UV light rays to sanitise water in spas. Think Death Ray for microbes.

Maybe it is an accident of evolution or just bad luck for microbes but the energy of some chemical bonds in DNA and RNA matches that of the UV radiation. The energy from the radiation is just right to break some of the chemical bonds. The result is that the micro organisms, such as algae, bacteria, viruses, cysts and protozoa, cannot reproduce and are killed.

What is sad news for micro-organisms, is great news for spa owners everywhere. Additionally the highly concentrated electromagnetic energy also destroys organic matter, eliminating the formation of dangerous chlorine by products.

Although the science behind UV spa sanitisers sounds like it is out of your favourite futuristic science fiction movie, in fact you will find it has been purifying drinking water and public swimming pools around the world for nearly 60 years. UV sterilization kills 99.9% of water borne viruses and bacteria, including the real tough bad guys like Giardia and Crypto sporidium viruses. For this reason, it is now mandatory on public swimming pools in many states in the US.

Contact the Spa Store Team with any questions.


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