Turbidity in water  is one ...

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Turbidity in water  is one problem , apart from this it is not recomended for high contaimimnation.Also with UV disinfection storage time is limited. It is not effective in case of recontamination. Unlike of chlorine where residuals are mantained which can counter minor contaimination post disinfection. Storage time for disinfected water should not be more then 4 - 6 hours.