Polyfilter is deffinatly the best product I swear by the stuff so does T1 and Cane. I change mine every 4 weeks this is my tank after 2 weeks of use and still crystal. and side on im 1 foot away looking down 8ft in length.
Yeah I love the stuff and you can tell the difference with out it after 4 weeks the water is clear but you can tell its not as clear as it is with fresh polyfilter I cant believe just how good a very worth while expense in my book.