Pack of (5) 4" Filter Bags, 100 Micron, Made in the USA

Five 4 inch Filter Socks (4" diameter, 13" long, 100 micron) Polyester Felt, Welded construction, Glazed Finish with 4" ring. Filter socks are the most convenient form of mechanical filtration. They remove excess food, detritus, organic waste, dust, and other particulate. Removing these particulate from the water column will reduce the amount of organic matter that produces ammonia and other undesirable substances in the aquarium. Filter socks also help prevent larger objects, such as sand, crabs, snails, etc. from damaging pump motors. Regular filter sock use will lower organic levels and result in CRYSTAL CLEAR WATER! Very high quality, Made in the USA