Red Sea 100 Micron Felt Fine Polish Filter Bag

The Red Sea 100 Micron Felt Fine Polish Filter Bag is a high-quality, reusable mechanical filter sock designed to provide ultra-fine filtration in sumps and filter systems. Its dense felt walls trap very small particles, detritus, and suspended waste — polishing already-clear water to a crystal-clear finish. At 26 cm long with a standard 4″/10 cm ring, it fits both dedicated Red Sea filter sock holders (e.g. REEFER, MAX-S) and any standard 4″ shaft holder. Ideal for mature aquariums with low particulate load or for use as a final polishing stage after coarser filtration, this 100-micron felt bag helps maintain water clarity, reduce organic waste load on downstream filtration (like skimmers or chemical media), and supports a cleaner, healthier aquarium environment.