"Iain Miller" wrote in message
...
snip
Not adviseable because as has been siad earlier in the thread, firstly
your
bio filter may die back very very quickly and secondly if your pond is
heavily planted the plants actually go into reverse and pull oxygen out of
the water at night....

I don't use a mechanical/biofilter. I am a purebred VF guy, and my pond is
heavily planted much like my pond is. I wondered about this months ago, and
was talked out of power cycling the pump, just wondering again.

BV.