Magnavore PURA Media Bag 3 Pack

300-micron 6" x 12" Self-Fastening. P?RA Media Bags are the safest and quickest way of implementing bulk media filtration in all fresh and salt-water aquarium applications. 300-micron mesh size ensures the ultimate media control. Self-fastening closure provides safe usage and easy servicing. 6" x 12" size makes the bags flexible to fit many applications.