That filter is a generic copy of my filter, the TetraTec EX models. Great choice, excellent filter. This is how I have mine set-up. Although I am maxed on my stock and my filter is rated for a 250ltr tank, mine's a 200ltr, I have crystal clear water. Mine has 4 trays and is set-up like this, starting from the bottom up;
Course then Medium sponge, in the same tray.
FULL tray of Seachem Matrix(bio-media).
Another full tray of Matrix.
A fine sponge, topped with Filter Floss.
Finally on top of that(same tray), 2 100ml bags of Seachem Purigen.