Ultraviolet systems are simple enough that many owners service them, and a professional visit is worth having where access is awkward or where the household would rather it were somebody else's responsibility. Knowing what a proper visit covers means you can tell whether you got one, because a lamp change alone is not a service.
What should be done every visit
The lamp replaced, regardless of whether it still glows, because germicidal output fades long before the visible light does. The quartz sleeve removed, inspected and cleaned, since a film of iron, manganese or scale cuts the dose exactly as a worn lamp does. The sleeve o-ring replaced, as it is a wear part and it is the seal keeping water out of the lamp chamber. And the intensity sensor window cleaned, if the unit has one, since it fouls from the same water and drifts as a result.
What should be checked
The pretreatment filters, because the lamp inherits whatever they deliver, and a sleeve that films between visits means they are not keeping up. The flow rate against the unit's rating, particularly if the household has added fixtures or changed a pump. The controller's power supply and any alarm function. And the general condition of the chamber and its fittings. Any of those can have changed since the last visit without anyone noticing, since the water gives no indication.
The part most often skipped
A test of the treated water. The EPA notes that private wells are not federally regulated under the Safe Drinking Water Act, so nobody samples on your behalf, and the system produces no evidence of its own success. A service that replaces a lamp and leaves without any confirmation that the water is right has verified the equipment, not the outcome. Ask for a sample to be taken, or take one yourself, at least after commissioning and periodically afterwards.
What to ask for and keep
The lamp part number fitted and the date, so the next replacement can be ordered and timed without guesswork. Any intensity reading before and after, which shows whether the clean and the new lamp actually changed anything. A note of the pretreatment cartridges fitted. And the test result. Kept together, those turn a series of visits into a record you can read a trend from. Our water treatment service guide covers what a full system visit includes.
Questions people ask about ultra violet water treatment
What should a UV service include?
A new lamp regardless of appearance, the quartz sleeve cleaned, a new sleeve o-ring, and the intensity sensor window cleaned.
Is a lamp change on its own a service?
No. A filmed sleeve cuts the dose exactly as a worn lamp does, so cleaning it is as important as replacing the lamp.
What is most often skipped?
A test of the treated water, which is the only confirmation the system is working, since it produces no evidence of its own.
What records should I keep?
Lamp part number and date, intensity readings before and after, cartridges fitted, and the water test result.