Polyfilter Can Replace A Skimmer?

[Exxcalibur]

I have seen a lot about the polyfilter brand filter, claiming that it can replace the need for a skimmer in a SW tank. Check out this video:
https://www.youtube.com/watch?v=qMIlWxX4q1c

Fact or fiction?

Can these filters be placed in regular hang-on-back filters and do the job of a skimmer?