No idea. Looked up the stuff though, you want it because they say it is pre cleaned? Do you believe them? For a big tank that sure would be nice.
I spent a solid 2-3 hours cleaning my 150 pounds of PFS a few weeks ago (may have over cleaned, the tank wasn't even remotely cloudy after dumping it all in...), was certainly questioning whether the cheap price tag was worth the effort. Looks great now though.