"TomM in NY" wrote in message
...
I want to switch from using pea gravel to a better medium in my bio filter
(made out of a plastic milk crate with cut to size furnace filter
surrounding
the inside-the pea gravel was inside and my pump was in the middle of the
pea
gravel).
I cannot believe how much bio balls are....seems pretty expensive for
plastic
balls!!! Anyone have any cheaper suggestions?

If you have a sawsall, you can but a length of 2'' PVC for a few bucks, and
chop it up into custom made bio balls.

--
BV.
www.iheartmypond.com