Ultra violet water treatment systems are used to kill bacteria in the water. The UV Rainwater Sterilisation System is an essential part of a rainwater harvesting system, if you are recycling rainwater to be used in your dishwasher, bath, shower or for drinking. The UV sterilisation system makes water safe for these. By killing the bacteria in the water it ensures safe drinking water. Ultra violet light is one of the safest ways to disinfect water as the UV rays are a natural component of sunlight. There are other water treatment products out there, but none of these are designed to combat bacteria, they only improve taste, clarity & scale. If you would like to purchase The UV Rainwater Sterilisation System as part of a complete rainwater harvesting package contact us to discuss your needs. All these units are British made.