Coralife (Energy Savers) ACL01219 100mc Pure Fluorescent Filter Pads, 36 by 30-Inch
PureFlo filter pads remove particulate matter from tank water in order to help maintain crystal clear water. When used on top of polyester filters the PureFlo filter will help prevent the clogging of the polyester filters but still allow the safe passage of beneficial bacteria into the aquarium.