For what it would cost or less for all the parts to make that work. You could get a Hot Magnum...
http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+3579+3597&pcatid=3597
And have better odds of clearing it up. Plus a desent all around filter in between times.
I've never used one to it's best capabilities, because I haven't needed to. But for something like your case.
Use the Micron Cartrige(comes with it).
And, diatomaceous earth. Ask your LFS if they have any.
How I'd go about it...
Hang on the side of a 5g bucket or equivelent, whatever.
Turn on.
Pour in diatomaceous earth.
When water is clear, move filter to aquarium.
http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+3579+3597&pcatid=3597
And have better odds of clearing it up. Plus a desent all around filter in between times.

I've never used one to it's best capabilities, because I haven't needed to. But for something like your case.
Use the Micron Cartrige(comes with it).
And, diatomaceous earth. Ask your LFS if they have any.
How I'd go about it...
Hang on the side of a 5g bucket or equivelent, whatever.
Turn on.
Pour in diatomaceous earth.
When water is clear, move filter to aquarium.