I've been trying to find out what this stuff is called, so i'll describe it the best I can.
Instead of BioBalls, you can use this plastic mesh looking product, which is supposed to be way better than bioballs. It really looks like someone had a hot glue gun of plastic and made a 1" thick mat of the liquid glue in a squiggled mess.. In Edmonton, AI uses it in their sumps. GOOGLE HAS FAILED ME...ARGH!
Thanks!
oooo I think i found it.. Matala.