Phyllis and Jim wrote:
Gill,

Jim and I circulate our pond water all winter here in Jackson. The
pump pulls from the bottom of the pond (deep well at 7'). That means
that the whole pond goes to 32 degrees when we have ice on the
top...which we have had for as long as several days. The koi and
goldfish did fine.

Phyllis


Thanks Phyllis........somehow I'd always got into my head that most
people turned off their pumps during the winter but it makes sense to
keep them going on reduced flow......well, this is from someone coming
from an aquatic background where turning off a filter long term is a big
no, no....

Gill