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P a g e
Water Quality Parameters
UV disinfection is extremely effective against microorganisms but only if the UV light can pass
through the water it needs to treat. This means that the quality of your water is very important
in order to ensure complete disinfection.
Treated water should be tested for at the least the parameters listed below. If the water exceeds
the listed parameters PURETEC strongly recommends that appropriate pretreatment equipment
be installed (equipment required will depend on parameters being treated):
Hardness:
<7 gpg (120 mg/L) – if hardness level is 7 gpg or slightly below the
quartz sleeve must be cleaned periodically in order to ensure effi-
cient UV penetration; if above the water must be softened.
Iron (Fe):
<0.3 ppm (0.3 mg/L)
Manganese (Mn):
<0.05 ppm (0.05 mg/L)
Turbidity:
< 1 NTU
Tannins (organics):
<0.1 ppm (0.1 mg/L)
UVT (transmittance):
>85% (Please contact PURETEC if water has a UVT that is less than
80% for pre-treatment recommendations)
You can have your water tested at a private analytical laboratory or by your local dealer. It is
always recommended to install pre-filtration of at least 5 microns prior to a PURETEC UV disin-
fection system.
