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I replaced the bio balls every 6 months. For the system I had it on was a 90 DT , 20 long frag tank and a 55 gal sump.
Here's the link for the bio balls
http://www.superskimmer.com/Bio%20Balls.htm
I owned one of these for yrs. I ran it externally with a iwaki 20rlt. This thing kicked a$$. I ordered replacement mini bio balls instead cleaning the one in the chamber. I believe I was running 9 mini bio balls. Definitely a great skimmer but not cost effective to run.
Wow. It's been a while since I updated. Well a little up dated.
I just started 2part dosing to keep my alk / cal from swinging so much.
I also had to vent my skimmers air line outside. I run a fireplace in my house so it's dropping my PH in the tank.
I've been having issues with my corals...
I saw a video with Mike Paletta doing just that. He was slowly acclimating some fresh water Mollies to saltwater cause said they eat the algae off the corals and not harming the corals.