Koi-Lo wrote, On 30/04/2006 16:39:
I've read in several places to turn your UV light off for (so many
hours) after adding any type of bacterial product. It's so easy to do -
why not?

Yeah, better to be safe than sorry. There's no point cooking bacteria
that you've just added to the pond.

You're probably right but not everyone has water going through their UV
filter at a high rate of speed. I don't know if that would matter or
not. I know ours runs through the UV unit at around 250gph in the
smaller 800g pond and you can see a difference in 24 hours. In less
than a week it's clear of visible algae.

I was jumping around between different ideas. I don't doubt that UV
lights help remove algae. The water speed is probably not an issue in
that respect because it's just altering some sugars (I think) in the
cell wall that cause adhesion. That has nothing to do with killing
bacteria as claimed by the UV sterilisers though. I was questioning
whether they are able to effectively kill all bugs in flowing liquid.

On the subject of killing _all_ bugs, do people use hydrogen peroxide
producing powders for killing bacteria and parasites. They are supposed
to replicate the pumped H2O2 solutions used in fish farms. I spoke to a
guy trying to sell some at a UK Koi show, I need more convincing though.

David



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DavidM