Red Sea 225 Micron Felt Filter Bag

The Red Sea 225 Micron Felt Filter Bag is a reusable mechanical filter sock designed to trap detritus, uneaten food, and particulate waste before it circulates further in your sump or filtration system. Its felt-wall construction effectively captures particles down to 225 microns while still allowing water flow — making it ideal for day-to-day maintenance, new setups, or after heavy maintenance when particulate load is high. At 26 cm long, it fits standard 4" (10 cm) filter-sock holders (including Red Sea REEFER and MAX-S sumps). Because it holds debris within the felt wall (not just on the surface), it helps prolong interval between cleaning cycles, improves water clarity, and reduces load on downstream filtration like protein skimmers and chemical media.