Filters are often used to REMOVE the yeast and and proteins and etc. One of the reasons that craft and homebrewing beers have taste. Yooper has a good run on this, search the site. Never said that you were a bad brewer never would say that without trying your beer. I have my beers come out clear if style calls for cloudy(heffe). Proper fermentation temps will help quite noticeably. If the beer doesn't clear on it's own and you could correct it by changing an aspect of your process, I have changed techniques that I have picked up on this site which is what I love about it. If your process is prefect I apologize. Supply houses are in business to sell items, they sell clear beer bottles too, but most brewers don't use them. IMHO. Good Luck