Pat,

I hate to sound stupid (although I'm getting used to it in my old age!), but
if your pond is only 18" deep, I would think that *air* temperature is a lot
more important than the depth of the frost line?

Granted, it's been decades since I lived in PA, and then we didn't have a
pond at all -- although we had, literally, Lake Erie for a backyard!

Anne Lurie
Raleigh, NC





"O3raledale" wrote in message
...
Hello all,
How does one find out what the frost line is in their area of the country?
I
live in Philadelphia, PA. and my pond is only about 18" deep. Will my
goldies
be safe in there over the winter with just a couple of air stones going?
Can I
leave my filter waterfalls/ stream going until it freezes to the point of
spilling out and then turn off the pump and start the air bubbler then?
Please
let me know your thoughts on this matter.
Thank you all,
-Pat