Ultraviolet light will not ...

Published July 28, 2017 10:59 by Muna Hindiyeh, Associated Professor at German Jordanian University. Senior Water Quality Expert

Ultraviolet light will not kill all type of microorganisms (water turbidity will also affect negatively). Their is always possibility risk from fecal, and pathogenic contamination. Or any Fault of UV light / Fault Shutting down.

So better to have an extra prevention measures which is residual chlorine dose + contact tank.