HOW MUCH DO THEY WORK
For being effective in the disinfection, an electro-magnetic wave, besides being of a certain kind (L = 254nm) it must possess also a minimum value of intensity to be able to ensure a minimum dose to water. A UV sterilizer, if correctly sized, is able to give water a dose sufficient for reducing almost all the commonest micro-organisms present in water. Normally a UV disinfection system must have a UV dose higher than 300 J/m2