Hi Eduardo, AS UV has no ...

Hi Eduardo,

AS UV has no residual disinfection downstream capabilities, all UV units would need to be point of use for each tap to comply with WHO and other regulatory guidelines for potable drinking water,  multiple small UV's would need to be considered.   

Basic alarms, clearly defined service intervals and maintenance over time is important as poor UV transmissivity, or non functioning lamps provide risk of pathogenic microorganisms infecting the people.  

Calcium chlorine tablet dosing systems  are cheap low tech that could be considered  and residual chlorine can be measured with low cost dip strips.   

A fundamental that must be considered is very low turbidity ( very clear water) is required for UV to not have particles shielding the virus, protozea, e-coli etc.   Ultrafiltration units that only require 2 m head to operate are the best way to ensure clean potable water.  Then any residual disinfection, or UV is a secondary precaution, not the key disinfecting technology.  

It is very cost and best practice effective to use an absolute barrier to microorganisms and colloidal sub micron particles such as gravity fed ultrafiltration (UF) system upstream of any UV or chlorine dosing.   

This ensures very low risk of transmission of water borne diseases despite less than ideal maintenance occurring.    You are welcome to get in touch if you require a price estimate.   Best wishes for your project.  Cheers Mark