A UV Steriliser is used to control the level of bacteria and pathogens that live in aquarium water without harming aquarium inhabitants or biological filtration systems, making this a great addition to any aquarium to give crystal clear water clarity
UV Sterilisers use high intensity UVC light to kill free floating pathogens and algae. One key point to note is that a UV steriliser will only kill those organisms which physically pass through it. In other words it can help stop a fish catching a disease but it can't cure an ill fish.