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For maximum UV germicidal efficiency source water (ie the water you wish to treat) needs to be relatively clear with minimal suspended solids.  

As UV treatment works by irradiating the waterborne pathogens it is most effective when it can pass unobstructed through these organisms.  Cloudy water in effect may "hide" these pathogens from the UV light and thus will reduce the germicidal efficiency of the UV treatment process.  

(Think of the suspended solids as a large number of small umbrellas with pathogens hiding under each one.  UV cannot effectively treat these pathogens as it cannot "see" them.)

Source water must meet these standards for effective UV treatment.

Turbidity 5 NTU
Suspended Solids 10 mg/litre
Colour NONE
Iron 0.3 mg/litre
Manganese 0.05 mg/litre
pH 6.5-9.5
Hardness 6 gpg

Pre-filtration may be necessary to ensure source water complies with these concentrations.

 

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Last modified: 06 January, 2008