Amazon.com: 4 Inch Ring Polypropylene Felt Filter Bag 1 Micron 4" x 9" Liquid Aquarium Filter Socks Size 3 - Pack of 2 (4" x 9", 1 Micron) : Pet Supplies
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Pentek 4" x 18" Polypropylene 25 Micron Filter Bag | R.C. Worst & Co.
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