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Perfect for using on your return pipe in your sump tank. Filter sock is made from high quality nylon, and can be cleaned and reused many times. Suitable for purification of planted aquarium tank, sea water tank aquaculture and ornamental fish tank.Able to keep impurities and microorganisms trapped in the filter bag. Ring width: 4 Inches. Length: 9"(short) and 15"(long) for your choice.