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
10 Micron Polypropylene Felt Bag W/ Polypro Ring
P-88-1476-A Filter Bag 'S' 5µm x40" PP Felt (Media) Polypropylene Felt EPDM ø5.5x40" Filter Bag - SERFILCO
Polypropylene Filter Bags | PONG Polypropylene Felt Filter Bags - Stream Tex Australia & New Zealand
POG5P2P 5 Micron Polypropylene Felt Filter Bag with Plastic Ring – Size 2 - Basco USA
FSI BPONG100P2P-WE PO-100-F02-E 100 micron Polypropylene Felt Glazed S
155385-03 - American Plumber 155385-03 - BP-410-5, Glazed Polypropylene Felt Filter Bag (5 Microns)
FSI 1 micron polypropylene felt size 2 bag filter - part # BPONG1P2PWE | eBay