UV light sterilization water filter is an important filtration treat your water without contaminating it with chlorine and other unwanted chemical etc. Using a UV light treatment or filtration system is a clean healthy way to guarantee your water quality is suitable to consume.
Rain water might contain bacteria of all types, but is some cases much more harmful bacteria may be present in the tank. E-Coli is a common type of bacteria in tank water and is due mostly to Frogs in and around your tanks/catchment.
The ultraviolet steriliser systems is useful untreated clean water to kill unwanted parasites, viruses and bacteria that cause illness.?? 
