Umnarj Paeratakul <umnarj at mozart.inet.co.th> writes:
>Dear good people,
>Can this be true? I thought that UV does not penetrate
>well in water.
UV can penetrate a thin layer of water and cause significant bacterial
mortality in the penetration layer. However, it does not have the residual
disinfectant activity which chemicals like chlorine do. I would not store
that water for too long.