An ultra violet (UV) aquarium unit works much the same way for a tank as it does for a pond. It sterilisers the aquarium water as it passes the bulb, to reduce and prevent unsightly green water algae. It can also help prevent the the outbreak of some diseases like Whitespot.
The UV bulb in the unit must be changed annually to ensure it works at its optimum.
We stock the TMC Vecton range of UV Sterilisers, which has proved to be very popular, being both easy to install and maintain, as well as the replacement bulbs.