The Ista Filter Media Bag is a fine-mesh nylon net designed to hold small aquarium filter media under 8mm in size (such as activated carbon, ceramic rings, or zeolite), making it easy to clean or replace loose media in canister filters and sumps.

Key Features:

• Fine Mesh: Built to trap small media pieces larger than 8mm from spilling into your system.
• Water-Neutral: Made from safe nylon material that does not alter water chemistry.
• Easy Maintenance: Allows you to quickly lift out chemical or biological media during tank cleanings.

Usage Tips:

• Best used for activated carbon, bio-balls, or ceramic gravel.
• Note that the mesh size is generally too large for microscopic resins like Seachem Purigen.
• Rinse the bag and media in old tank water before placing it into your sump or canister filter.