Eshopps Rectangle Micron Bag HolderDescriptions Eshopps Micron Bag Holders are easy to install filter bag holder for any sump filtration system. The Micron Bag Holder enhances mechanical filtration, which helps reduce the amount of ammonia producing organic matter in your aquarium. It also helps prevent larger objects such as sand, crabs, and snails from damaging pump motors, as well as unsightly aquarium debris. Micron bag & Bulkhead included. Features Micron bag Can be use on acrylic