UV sterilizer too much dwell time? - Page 2 - Tropical Fish Keeping - Aquarium fish care and resources
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post #11 of 18 Old 05-03-2013, 03:01 PM
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so a 3w bulb has the same intensity as say a 30 watt?

a low flow/low waatt bulb is generally seen in uv's that are more focused towards green water while the higher end sterilizing ones are higher wattage and can have a higher flow. "dwell time" or I would rather call it exposure time im sure directly reflects how good of a performance you are getting along with how big /higher the wattage is.

ive heard of a guy getting gram neg filtration with a 30 watt at like 90 gph... never heard of such filtration at lower wattage then that unless the water was maybe trickling through...
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post #12 of 18 Old 05-03-2013, 07:46 PM
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so a 3w bulb has the same intensity as say a 30 watt?

a low flow/low waatt bulb is generally seen in uv's that are more focused towards green water while the higher end sterilizing ones are higher wattage and can have a higher flow. "dwell time" or I would rather call it exposure time im sure directly reflects how good of a performance you are getting along with how big /higher the wattage is.

ive heard of a guy getting gram neg filtration with a 30 watt at like 90 gph... never heard of such filtration at lower wattage then that unless the water was maybe trickling through...
No, a 3 watt bulb and a 30 watt bulb do not have the same intensity - that was the point I was making. Because a 3 watt bulb is weak, the amount of exposure time needs to be high because it will take longer to kill something. A 30 watt bulb is powerful, so it will kill things quickly and so a shorter exposure time is necessary. Of course one can have a prolonged exposure time with a high wattage bulb, but like I said it doesn't make things any deader. And of course a high flow with a low wattage bulb renders it useless.

I've spent an embarrassingly massive amount of time on forums and I've never heard of gram negative filtration. I assume you mean his UV kills gram negative bacteria? That would be expected from a 30 watt bulb, as that's quite powerful. But that doesn't mean that a lower wattage bulb doesn't as well, under the right conditions. I'd like to know how this guy determined he had "gram negative filtration".


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post #13 of 18 Old 05-05-2013, 10:28 AM
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... the things aren't going to get any deader by spending the extra time in front of the bulb.
What about zombie organisms? I mean, they're dead ... yet not dead
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post #14 of 18 Old 05-05-2013, 03:51 PM
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I'm on the UV being unnecessary side.

The higher the wattage the longer the bulb which allows for longer exposure. The intensity at any point along the bulb may be the same between a 3or 30 watt so the length of the bulb given identical flow rates would lead to a longer exposure, not necessarily a more intense exposure. Because UV light is harmful I think they are restricted to certain intensities for residential use. But don't quote me on that.

Jeff.


Total years fish keeping experience: 7 months, can't start counting in years for a while yet.

The shotgun approach to a planted tank with an LED fixture

Small scale nitrogen cycle with a jar, water and fish food; no substrate, filter etc
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post #15 of 18 Old 05-05-2013, 05:48 PM
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No, a 3 watt bulb and a 30 watt bulb do not have the same intensity - that was the point I was making. Because a 3 watt bulb is weak, the amount of exposure time needs to be high because it will take longer to kill something. A 30 watt bulb is powerful, so it will kill things quickly and so a shorter exposure time is necessary. Of course one can have a prolonged exposure time with a high wattage bulb, but like I said it doesn't make things any deader. And of course a high flow with a low wattage bulb renders it useless.

I've spent an embarrassingly massive amount of time on forums and I've never heard of gram negative filtration. I assume you mean his UV kills gram negative bacteria? That would be expected from a 30 watt bulb, as that's quite powerful. But that doesn't mean that a lower wattage bulb doesn't as well, under the right conditions. I'd like to know how this guy determined he had "gram negative filtration".


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internal UV filter recomendation?

reply #23 I believe
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post #16 of 18 Old 05-05-2013, 06:18 PM
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Well, reply #24 - that is one mention. I never went back to the thread so I missed it

I'm not commenting on whether he did or did not, because I don't know enough about the story to have an opinion. But just because someone says something on the internet doesn't mean it's true. Doesn't mean that they are a liar, either. If anyone wants to do research on this matter, I hope that they do and that they come back here and share it with us, so that we may understand these things just a little better.

125 - BGK, chanchito cichlid, pictus cats, silver dollars, palmas bichir
125 - cichlids (severums, bolivian rams, chocolate), rainbows ( turquoise, red), loaches (angelicus, zebra, kuhli and horseface), plecos (BN, RL and clown), denison barbs, tiretrack eel, pearl gouramis, betta
90 - Congo tetras, african knife, upside down cats, spotted ctenopoma, kribensis, delhezzi bichir
2.5 - betta
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post #17 of 18 Old 05-05-2013, 08:18 PM
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Gram negative bacteria is just a classification of the bacteria based on a staining method called the Gram stain. E coli I think is an example of a gram negative bacteria. You hear this talked about in ceramic filtration but whether it's gram positive or negative in that case makes little difference as it has to do with the size of the bacterium and filter media pore size, not how thick or tough the cell wall of the critter is.

Unless he could identify the bacteria visually or culture them to administer the stain test, perhaps he had an outbreak with very specific set of symptoms that point to a particular strain of bacteria and it couldn't have been anything else....

Mitch, your water issue cleared before you bought a UV unit, didn't it?

Jeff.


Total years fish keeping experience: 7 months, can't start counting in years for a while yet.

The shotgun approach to a planted tank with an LED fixture

Small scale nitrogen cycle with a jar, water and fish food; no substrate, filter etc
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post #18 of 18 Old 05-06-2013, 06:14 AM
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