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The 100 micron Red Sea Reefer Filter Sock is a high quality, reusable aquarium filter bag providing different levels of mechanical filtration. These 10.5"/26cm long filter bags for Red Sea's REEFER and MAX-S aquariums will also fit any standard 4"/10cm filter bag holder.
100 micron felt filter bags are designed to provide fine "polishing" of water that is already low in particulate matter (mature aquariums).
The 100 micron size will filter out fine particulate matter from the aquarium, and is reusable after cleaning and rinsing in water.