Do I need to buy a filter for an aquaclear 10

[navillusii]

I bought it and its I think its just a pump and I need to buy the filter separate.

http://www.amazon.com/AquaClear-Powerhead-10-Gallons-Hour/dp/B0002DHMYM

 

[sureal00]

I believe that is true.There seems to be an attachment for filtering