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Comparing the Systems
Comparison of the Currently Used Disinfection Methods

Characteristics Ultraviolet Chlorine Ozone
Investments costs Low Lowest High
Operating costs Lowest Low High
Installation requirements Excellent Good Bad
Maintenance requirements Excellent Good Bad
Maintenance costs Lowest Average High
Maintenance frequency Seldom More frequent More frequent
Supervision Simple Difficult Neutral
Disinfection efficiency Deactivates all microorganisms Leaves some pathogens Deactivates all microorganisms
Changes in the water No changes Organice chlorine combinations, changes in taste and smell Not known
Contact time 0,5 - 5 seconds 30 - 60 minutes 10 - 20 minutes