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Filter socks stay hidden out of the way in the sump, but they are a boon for clear aquarium water. Micron filter bags provide excellent mechanical filtration, which helps reduce the amount of ammonia-producing organic matter in your aquarium. They also help prevent larger objects such as sand, crabs, and snails from damaging pump motors. . 300 micron 4″ filter bag unpackaged in a box of 25 pieces. Excellent mechanical filtration. Priced favorably to sell.