Ditto. Big Al's stuff is perfect for canister filters. http://www.bigalsonline.com/BigAlsUS/ctl3684/cp18430/si1382113/cl0/bigalsfilterfloss20sqft The photo makes it look like a big blob of cotton, but it is actually a roll of material almost identical to that of Eheim white pads. It is simple to cut to size. A rol of this stuff will equate to 20-40 Eheim pads (depending on model).BORG?
I stuff my filters with polyester floss. 20 square feet is about $10 at Big Al's.
Dont use it Walmart Polyfill is recycled poly and treated with chemicals in the recycling process my fish got sick from it, very bad stuff