Red Sea 100 Micron Filter Sock
A range of 3 high quality, reusable aquarium filter bags providing different levels of mechanical filtration. These 10.5″/26cm long filter bags are designed for Red Sea’s REEFER and MAX-S aquariums and 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, ideal for mature aquariums.
| Specification | Details |
|---|---|
| Filter Material | Felt |
| Filter Pore Size | 100 microns |
| Length | 10.5″ (26cm) |
| Compatibility | Red Sea REEFER, MAX-S, and standard 4″/10cm filter holders |
FAQ
What is the purpose of the 100 micron filter sock?
The 100 micron filter sock provides fine mechanical filtration to polish water in mature aquariums with already low particulate levels.
Can this filter sock be used with other aquarium models?
Yes, it fits Red Sea’s REEFER and MAX-S models and is compatible with any standard 4″/10cm filter bag holder.
Is the filter sock reusable?
Yes, the filter sock is made of high-quality felt and is designed for repeated use.

Stephen Pullman –
The filter sock fits perfectly in my REEFER system. After a few weeks, I noticed a significant improvement in water clarity, especially in the later stages of tank cycling. It’s easy to clean and lasts longer than the disposable filters I used before.
Isaac Bond –
Works well as a polishing filter in a mature reef tank. The 100 micron size is just right for removing fine particles without clogging. I’ve used it for over two months and it still performs well.
Trevor Vaughan –
Great fit with my MAX-S filter. The felt material holds up well and doesn’t degrade quickly. I appreciate the fine filtration it provides, especially in a stable, mature aquarium environment.