On Fri, 23 Nov 2007 12:35:32 CST, Derek Broughton
wrote:

Since I don't believe that you can get stratification in winter in a 15"
deep pond, it makes no difference (to temperature) whether a bubbler is
used or not. The bubbler exists just to keep a hole open, and . The
concept of "hyper chilling" makes no sense to me. Goldfish will survive
water right down to the freezing point (with the odd claim that they
actually survived freezing - but I think there'd be lab experiments to show
that if if really could happen). You can't make a pond get colder than
that without salting it (noticeably more than the prophylactic salting many
use), and a bubbler would actually make it even _less_ likely (try super
cooling water at home - you can do it, but stirring it will make it freeze
immediately).

....stirring make it freeze immediately....

That goes against the principal that moving water doesn't freeze as fast as
still water, doesn't it? ~ jan
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Zone 7a, SE Washington State
Ponds: www.jjspond.us