I'm in Thornhill, it's mild now, above 0C.

I'll have to see how I can put a vent in without the animals going in to
where its warmer without letting too much cold in.

Joel.


"Bill Stock" wrote in
:


"Joel" wrote in message
4...
as it hits as low as -40C here in the Toronto Area, I finally desided
to check on the pond for the first time this winter, I had built a
teepee style top over my small pond which at the centre is about
18inch high down to about 8 inches around the sides, I have an air
hose doing the bubbles and I have covering over the whole top heavy
liner, since it snowed, I have
about 6 inches of snow over the whole pond.

-40C? You must be in North Toronto! I think the worst I've seen was
-23C or so.

Today I dug out a portion of the liner where the airline is to see
how much
of a hole has been kept open, and to my surprise, there is no ice on
the pond at all.

I checked mine about a week ago and it was the same as yours, no ice.

Last year I did the same thing but there wasnt any snow and I had ice
about
6 inches thick.

Snow really works well as an insulator.

I recovered the liner with snow, my question is this

its pretty much an airtight lid over the pond, the bubbles are
keeping the surface of the water moving so the gases dont settles
over the water, but what about the airpocket I have created with the
cover, is the gas collecting in there, should I have some venting
happening ? could I just over the liner once in a while to put fresh
air in there ?

I had the same concern, especially with the layer of freezing rain we
had last week. Although there's about a foot of air space between the
water and the cover. I'll have to get my ice pick out and dig them
out.