Hi Gloria, Technically, it ...

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Hi Gloria,

Technically, it would be better if you 1st use chlorine for killing most of microbes keeping at least 1 hour retention time with minimum free residual chlorine 0.2 ppm (preferably 0.5 ppm) and then use UV if legislation requires! Usually if you use residual chlorine for 2 hours retention, there is no need for other disinfection. However, one may prefer it to make it doubly sure!

 

Regards,

VM

1 Comment

Thanks for your reply. UV is required for the risk of cryptosporidium.

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