yah i just ordered one cause this filter sock business is dumb 3-4 days its over flowing cause its clogged... im battling crazy algae its either red cyano or dinos not 100% sure but its killing my tankWorks very good. I got rid of a dozen filter socks and used the cup with this floss which is cheap. I toss it every couple of days and just pop in new floss. Quick and easy; rinse the cup out every so often.