NEZO filter bags offer superior mechanical filtration, effectively reducing the amount of ammonia-producing organic matter in your aquarium. This also aids in protecting aquarium equipment from damage caused by both large and small objects, such as sand and coral.

Solid construction and heavy duty stitching make these socks strong and durable so they can be cleaned and reused numerous times. Machine washable. You will receive four universally sized 4-inch filter socks. Great for sumps and ponds in freshwater and marine applications.