Koi-Lo wrote, On 30/04/2006 15:05:

wrote in message
...
When using Interpet Sludgebuster or any other of these sludge clearing
bacteria agents is it necessary to turn off the UV ?

I'm wondering if the UV will kill off the useful bacteria.
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*Note: There are TWO "Koi-Lo's" on this NG*

The useful bacteria are mainly on all pond surfaces and in your filter.
Not many are in free in the water. It's better to turn off the lights
when you add bacteria and give it a chance to settle. Leave the UV
lights off for a least 24 hours. No use adding them and then killing
many of them off as they go through your UV light unit.

Depends if you have a UV Sterilizer or just a UV Clarifier. Clarifiers
are the most common type. UV causes the algae to coagulate making it
easier to filter out, it goes between the pump and filter. Very unlikely
to kill bacteria in solution.

To kill bacteria you require a very powerful UV source. Probably needs
to be installed after the filtration stage for best water transparency.

Sounds like a risky business to me, it takes high doses of UV to mutate
bacteria in the lab. Flowing water past a lamp for fractions of a second
seems pretty pointless. More likely to produce mutant strains than
sterilisation I would think.

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DavidM