3/4" Thick Universal Pond Filter Mat/media/pad 12" X 48" Water Garden Fountain This high quality poly filter pad is designed for water filtration in aquarium and ponds. It effectively removes particulate matter mechanically. It also allows thriving population of beneficial bacteria to aid in the establishment and maintenance of the biological balance in the aquarium and pond. Buy in bilk and cut your own size filter pads to use on a variety of water filtration applications. Poly Filter Pad Dimensions: 12" wide x 48" long x 3/4" thick