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+--- Thread: Ratlung. Worse than we thought. (/showthread.php?tid=19096)
RE: Ratlung. Worse than we thought. - Eric1600 - 01-17-2018
Tink that probably wouldn't work for two reasons. Light intensity decreases with the square of the distance. Thats way UV systems are long reflective cylinders to keep most of the water flowing close to the light. So you'd need a really powerful set of lights. But the second problem is clarity. You'd need to remove all the particles because anything bigger than about 20 microns will block light. Statistically if it ran 24/7 the exposure rates might be high enough to get everything, but you'd have to have a lot of really bright lights and pretty clean water.
RE: Ratlung. Worse than we thought. - Midnight Rambler - 01-19-2018
quote:
Originally posted by Eric1600
In the test report I linked 24,000 uws / cm^2 took 9-12 minutes of exposure which no household equipment can do because that flow rate would be about 0.05 gpm (rough estimate) and it would be way too slow based on the common volume of household UV filters.
Read it again: their lamp was 24 uw/cm^2 (u=micro), not 24 mw/cm^2. That's like a regular blacklight. 100% inactivation was reached at a dose of 3.6 mws/cm^2. Home systems deliver a dose of 16-40 mws/cm^2, so even the weaker ones should be capable of killing them. Given that they do so in a very short time (the one I have does 40 at a rate of 11 gallons per minute, and my pump can only do about 6 gpm max), it means the lamp on a home system is something like 10,000 times more powerful in the UV range.
That said, another study I found that looked at this (I don't have the link offhand) found a big difference between species of nematode in how much they can tolerate. You would expect free-living ones like the one in the study to be more tolerant of UV, since they would occasionally be exposed to the sun while parasites are always inside something else. But you never know; they might have some kind of skin to protect them from the host that also protects from UV.
That's why I said they need to do just this sort of test on RLW specifically.