Today I have bought an aditional water filter (http://www.marineland.com)... Here is how it looks in realty...
It will be an additional filter towards to the canister filter and consists Bio-Grid Biological filter plate as biological surface for support of BIO-Spira nitrifying bacteria. Combines with Venturi-action Impell Air Tube assembly to deliver advanced wet/dry biological filtering action. And some kind of filter catridge with improved Black Diamond Premium Activated Carbon.
I think it must to be a good choice.
P.S. I don`t want that you look at a hole videoclip in Russian but just since 17:07 till 19:18 it talks about filtration setup as 3 different types of filters in one aquarium. http://youtu.be/StfKsPBI57k
May be it can be interesting to see.
I can interpreting a bit that here is a general director of a company in Russia who`ve decided to make a big aquarium for big fishes in his office as an interior detail. So they use 3 types of filtration systems: biofiltration as a canister filter, small chemical filter and additional filter as mechanical filtration. And the aquarium must to clean, in this case, every one week.