Red Sea 4 inch Felt Filter Sock, 100 Micron - Fine Polishing
![](https://cdn.shopify.com/s/files/1/1233/2986/files/Red_Sea_c1b8a89a-acb5-4efb-bfa6-c38d54117675_160x160.png?v=1637793669)
- 100 micron felt filter bags are designed to provide fine ‘polishing’ of water that is already low in particulate matter (mature aquariums).
Red Sea | BFA Item # |
Filter Sock 4 in x 12 in - 100 micron | RS42195 |