Seachem The Bag - 180 Micron - 5 in. x 9 1/2 in.
The Bag is an innovative welded filter bag with a durable non-stiched seam.  Unlike nylon or similar bag materials, The Bag is resistant to bleach, caustics, and acids.  It will not degrade over time and will easily last several years.  It has a 180 micron mesh and comes with a convenient resealable locking closure.  The bags size makes it easily adaptable to almost any kind of filter.