Upgrade your aquarium filtration with these premium media bags for aquarium filters. Crafted from high-quality, corrosion-resistant polyester, they are safe for all aquatic life and won't degrade with exposure to bleach, acids, or water treatments. Each bag measures 7.87x5.9in (20x15cm) and features a fine 1.5-2.5mm mesh that holds carbon, bio balls, ceramic rings, lava rock, coral sand, and more, boosting your filter's efficiency. The sturdy plastic zipper design ensures a tight seal, unlike drawstring bags that can loosen over time. Prevent filter clogging and accidental ingestion by fish, keeping your water crystal clear and inhabitants healthy. Suitable for freshwater and saltwater tanks, canister filters, power filters, sumps, and more. Comes in a convenient 10-pack, perfect for customizing and maintaining your aquarium's unique filtration needs.