actually, Im going to be really running a little test all on my own anyway, so i could find out.
right now my pond is not set up as all the water is drained and all the media in the filter is frozen out in the unheated shop.
My plan is to get the pond going in about a month when it's warm enough not to freeze the water.
I could just add new tap water, add the ant-Clor stuff, and turn on the pump to see if a test of the water in 2 weeks shows that the filter is up and running without adding any bio-life from the store of fish to the pond?
If the pond water test show that the filter is working, then that would seem to prove that some bio-life was able to come back to life from a frozen state.
(perhaps not all the biolife, but some)