Why is an ultraviolet steriliser useful in a shellfish holding system?
Ultraviolet (UV) sterilisers are a highly effective tool in keeping your shellfish holding system water clean and healthy. While not essential, we strongly recommend using one, as it helps prevent bacterial blooms by zapping harmful microorganisms with UV light as the water passes through.
There is an ultraviolet steriliser on all our systems, including the Lobster Pod, Crab Pod, Bivalve depuration systems and Oyster Pod.
How often should you change a UV steriliser bulb?
Like any UV system, the bulb’s efficiency degrades over time. That’s why we advise replacing it annually to maintain peak performance. In bivalve purification systems the UV bulb needs changed every 4000 hours which is approximately every 6 months of continual use.
How do you safely change a UV steriliser bulb?
Start by switching off the power to your shellfish system including both the main pump and the UV steriliser. This ensures the unit is safe to open. On most systems a locking mechanism needs to be released and the UV head twisted slightly before gently pulling up the quartz sleeve tube being careful not to lose the O-ring.
Why does a UV steriliser become less effective over time?
There are two main reasons why UV effectiveness reduces over time:
- The bulb ages and produces less UV light.
- Muck collects on the quartz sleeve, blocking UV transmission.
Remove the quartz sleeve by unscrewing the grub screw and gently withdrawing it using a rocking motion. Clean off any build up or sulphate deposits thoroughly and let it dry completely before reassembling.
What should you check when fitting a replacement UV bulb?
When replacing the bulb check that it is the correct wattage and pin configuration (e.g. 36W, 4-pin). Handle the bulb with clean hands or a cloth to avoid greasy marks which can shorten its lifespan. Refit all spacers and components carefully and screw the sleeve back on without overtightening.
What safety features does the UV steriliser have?
A key safety feature prevents the unit from turning on unless it is fully assembled. The magnetic switch ensures that no UV light escapes during servicing, as UV radiation is extremely harmful to eyesight.
Can you run a Lobster Pod without the UV steriliser?
If the quartz sleeve is damaged or you’re awaiting parts your Lobster Pod system can continue to run by bypassing the UV steriliser using the three-valve setup. Simply close the inlet and outlet valves and open the bypass to keep water circulating.
What should you do after replacing the UV bulb?
Once everything is reassembled and checked switch the system back on. Your steriliser is now ready to continue supporting a clean and safe environment for your shellfish.
If you need more advice or would like to order a replacement UV bulb email us at
Last updated October 2026
