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Amazon.com : Aquatic Experts 200 Micron Drawstring Filter Socks - Felt Filter Bags - Custom Made in The USA (7 inch by 16 inch, 2 Pack) : Pet Supplies
Waterbox Felt Filter Sock – 2.75″ 225 Micron for sale online | eBay
Amazon.com : ZCONIEY Filter Socks 180 Micron 4 Inch Opening x 14 Inch Long Aquarium Nylon Filter Bags Felt Filter 3Pack : Pet Supplies
Sock Canisters from Pro Clear Aquatic Systems | Reef Builders | The Reef and Saltwater Aquarium Blog