Seachem The Bag Welded Filter Bag is welded filter bag with a durable non-stitched seam. The Bag is unlike other filter bags in that it is resistant to acids, bleach and other harmful materials, and will not degrade over time. Resistant to bleach, caustics and acids Easily usable with almost any kind of filter Welded filter bag with durable non-stitched seam Utilizing 180 micron mesh, the welded filter bag comes with a convenient resealable locking closure and is easily adaptable to many different varieties of filters.Specifications: 180 Micron Mesh Bag (5"W x 10"H)