http://www.youtube.com/watch?v=R__JTUX9nk4
This has to be one of the worst videos on YouTube but it's better than nothing - at least the guy is trying to help.
The filter seems to be a plastic dog muzzle thing with a ping-pong ball inside it inside a housing of some sort close to a pump.
The pump will have a pipe in and a pipe out and a couple of wires to make the pump motor work.
http://www.youtube.com/watch?v=R__JTUX9nk4
And here's another W/mc video showing pump removal
http://www.youtube.com/watch?v=IE0pVylYO6I
Good luck...
Peccavi
May 2013