Kuro507 Posted January 3 Share Posted January 3 We recently moved to a house with an existing borehole, a water test was arranged by the seller and the recommendations included installation of a UV filter. We had a local company install a UV filter, along with a new media filter etc. All working ok. Onto my question, is there a need for the UV filter to be running 24x7? Or could it be on a timer switch so its only on when we are awake? Could switching it on and off decrease its life in some way? Its consuming 42w, 24hrs a day at the moment. Link to comment Share on other sites More sharing options...
JohnMo Posted January 3 Share Posted January 3 So you don't open a tap or flush a loo in the night? Nothing uses water? If you do use any water - you introduce anything UV kills off. Do you want that? My answer was no. So run 24/7/365 and replace every 365 days. 1 Link to comment Share on other sites More sharing options...
sharpener Posted January 3 Share Posted January 3 If there is a pump which is controlled by a flow/pressure switch then you could link it to that, providing the lamp is instant start (which our Pentek UV lamp is). Ideally with a bit of run-on time after pump switches off. But I haven't bothered to do this, the system is complex enough already. We are away quite a lot and turn the system off then. There is a 5 micron filter upstream which avoids nasties hiding in the shadow of any dirt particles. And a solenoid valve which prevents downstream migration of any nasties when the lamp is off. I have replaced it once in 17 years, they seem to last more or less indefinitely and the advice to replace annually is IMHO nonsense. Our steriliser is specified for twice the actual flow rate so the dwell time is twice as long as necessary which gives a good margin. Tested for bugs yesterday and all OK. Link to comment Share on other sites More sharing options...
JohnMo Posted January 3 Share Posted January 3 3 hours ago, sharpener said: If there is a pump which is controlled by a flow/pressure switch then you could link it to that, providing the lamp is instant start (which our Pentek UV lamp is). Ideally with a bit of run-on time after pump switches off But don't do that if there is a accumulator between pump and UV filter. From here https://www.knowyourh2o.com/indoor-4/uv-disinfection#google_vignette UV systems are designed for continuous operation and should be shut down only if treatment is not needed for several days. A few minutes for lamp warm-up is needed before the system is used again following shut-down. In addition, the plumbing system of the house should be thoroughly flushed following a period of no use. Link to comment Share on other sites More sharing options...
SteamyTea Posted January 4 Share Posted January 4 Can you change, what I assume is a fluorescent light to an LED one? That may save a few quid a year. Link to comment Share on other sites More sharing options...
JohnMo Posted January 4 Share Posted January 4 The bulb heats mercury I believe, so a different type of bulb Link to comment Share on other sites More sharing options...
SteamyTea Posted January 4 Share Posted January 4 3 minutes ago, JohnMo said: The bulb heats mercury I believe, so a different type of bulb Right. Found this page. https://www.waterfilterman.co.uk/121-uv-lamps-water-sterilisation They have, what seems to me, cheap, low powered units. No idea what the technology is. I like old Jeremy Harris's ozone treatment, when he was showing me it, I asked if it could have been smaller, and he said yes. An old customer of mine had a commercial laundry (quite big business down here) and they used ozone and a lower temperature to save energy. Needed a special license/approval, but that was a formality, so nothing special. Meant they could wash at 55°C with water heated from a CO2 heat pump. Link to comment Share on other sites More sharing options...
sharpener Posted January 4 Share Posted January 4 4 hours ago, SteamyTea said: An old customer of mine had a commercial laundry (quite big business down here) On the A303 we often see Johnson's Workwear vans taking hotel laundry from London to ?Cullompton to be washed. I imagine the tourist industry in the SW creates a big demand for such services. 4 hours ago, SteamyTea said: Found this page. https://www.waterfilterman.co.uk/121-uv-lamps-water-sterilisation They have, what seems to me, cheap, low powered units. No idea what the technology is. Low pressure mercury arc. Like a fluorescent tube without the phosphor coating, and with a quartz envelope which transmits UV. Link to comment Share on other sites More sharing options...
SteamyTea Posted January 4 Share Posted January 4 3 minutes ago, sharpener said: I imagine the tourist industry in the SW creates a big demand for such services It does. And during the off season they 'take in laundry' for pin money. Link to comment Share on other sites More sharing options...
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