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We design, manufacture and sell UV disinfection units to clean indoor air and surfaces in public spaces. But UV is also an exceptionally effective way to keep drinking water safe and clean, killing pathogens quickly and efficiently. So how does the tech work and what are our expert tips?
Our expert tips on private water supply UV disinfection
Ultraviolet irradiation is a common way to disinfect private water supplies. But here’s our first tip: you can’t just pick up any old UV unit and hope it’ll do the job. The unit must be designed specifically for treating drinking water, and the best units are specially approved for the purpose. A simple UV used for ponds and fish tanks, for example, is no good for drinking water.
How UV water purification units work
The UV radiation is generated by special lamps, which are safely enclosed in a plastic or steel reaction chamber and sleeved to keep them dry.
Disinfection happens when there’s enough UV, in other words a big enough dose. For water purification that’s generally about 40mJ/cm2.
The water’s UV transmittance or UVT is important, since if the rays can’t get through the liquid because it’s too murky, the UV can’t do its job. We’re looking at a minimum UVT value of more than 90%, ideally at least 95%.
We recommend you include all the added extras
Like our UVC disinfection units for air and surfaces, water purification involves the right blend of time and UV intensity, laid down in the manufacturer’s recommendations for each unit.
Point-of-use water purifying UV units rarely include a UV monitor and alarm, but they’re usually available separately, and of course as UV experts we recommend you use every added safety feature there is.
UV irradiation equipment designed for water purifying tends to be easy to operate, with simple maintenance. Some units clean themselves, others have to be cleaned manually. The water purifying units, like our air and surface purifiers, work quickly, with a highly effective yet short contact time. Also like our UV units there’s no impact on health. As long as the system is clean and working properly, the water will be safe to drink.
Some units actually stop the water flowing if it isn’t properly disinfected. The best units also come with features like UV intensity monitoring, lamp run time controls, and automatic water shut off in case the lamps fail. If fitted in hard water, you’ll need to take the effect of limescale into account and keep it under control.
And finally – recommendations for replacing the bulbs
Our air and surface UVC units contain LED bulbs, which are cooler than ordinary UV bulbs and don’t contain any mercury. But many UV disinfection units for private water supplies still use low pressure mercury bulbs to generate the UV light at the correct wavelength. Which brings us to our final tip... because the intensity of UV radiation emitted from mercury lamps decreases with age, dropping around 30% over 12 months while not losing any brightness, you’ll need to replace them regularly to keep your drinking water clean. Luckily, although it involves some down-time, it’s usually quite easy to do.
Keep the air and surfaces at your business hygienic and safe
Keep the air and surfaces at your premises clean and hygienic with our fitted and mobile UVC units. They’re simple, affordable, and thanks to our UV expertise they’re designed to do a top job in no time.