"John Burton" wrote in message
...
We had a good freeze last week, ended up with ice across my entire pond
except 1) where the water falls from the bio filter and 2) the skimmer.

Question is this. In order to be prepared for the next freeze (spring
ain't
here yet) I'm wondering what type of heater (or bubbler) I should install.
Y'see I have an 11' x 16' pond, about 24" deep at the deep end. Seven
Comets and one Koi in the pond as of last spring, but I haven't seen them
for nearly two months. I expect they're hiding in the hidey holes built
by
all the rocks that line the pond.

I use a small pump sitting in a filter box in the shallows. It moves the
surface water without circulating the lower, warmer water. Some other PORG's
have had bad experiences with this method, but so far, it is working just
fine for me, keeping a nice hole open. I'll check in again in February and
see how happy I am. LOL.

BV.
www.iheartmypond.com