In my opinion, all of those "nitrate fixers" are worthless. I have never seen results from Chemi-Pure, Kent's Nitrate sponge, anything.
The best way to remove nitrates is water changes and the use of a refugium.
That skimmer is a waste. You would be much better spending your money on a higher quality skimmer, like aN AquaC Remora, Coralife, or Excalibur.