UV e-boiling employs ~ultraviolet rays at 253.7 nm to kill viruses and bacteria in your water. This disinfection process is fast and safe. It delivers water that is as safe and pure as water boiled for over 20 minutes. Ideal for treating water with a TDS level of 1 - 200 mg/litre. It is best used to purify water from municipal water sources like dams, lakes and rivers.