Red Sea 225 Micron Thin-Mesh Filter Sock

High-quality, reusable 225 Micron Thin-Mesh Filter Sock designed for Red Sea REEFER and MAX aquariums. At 10.5" / 26 cm long, it drops directly into the stock sock holder with no modification. The 225-micron mesh catches debris while flowing fast — a great everyday choice for most reef tanks.

Have a Max Nano instead? See the sized-for-Nano 225 Micron (2 Units) or 100 Micron (2 Units).

Browse more filter media in our Filter Media & Cartridges collection.

• 225-micron thin mesh — balanced catch & flow
• Fits Red Sea REEFER and MAX aquariums (10.5" / 26 cm length)
• Reusable — rinse or machine-wash clean
• High-quality stitched construction
• Improves mechanical filtration and water clarity

Will this fit my Red Sea Max Nano?
No — this 10.5"/26 cm sock is for REEFER & MAX. For the Max Nano, use the Max Nano 225 Micron (2 Units) or Max Nano 100 Micron (2 Units).

How often should I change filter socks?
Every 3–7 days depending on bioload. The longer they sit, the more they become a nitrate source.

Are they reusable?
Yes — rinse thoroughly or machine-wash (cold, no detergent fragrance). Replace once fibers break down.