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【Premium Mesh Material - Safe for Your Fish】Made from high-quality, non-toxic mesh that won't leach harmful chemicals into your aquarium water. Durable with wear-resistant, these filter bags hold up to repeated use without tearing. Completely safe for freshwater with saltwater tanks - helps keep your fish healthy with thriving. 【Plastic Zipper - No Rust, No Jamming】Unlike metal zippers that rust with seize up, our plastic zipper stays smooth with functional even in constant water exposure. Securely seals to prevent loose media from escaping into your tank. Reliable closure that gives you confidence every time you refill. 【1mm Fine Mesh - Keep Media Contained】Tightly woven 1mm mesh effectively contains all your filter media - from tiny activated carbon granules to ceramic rings with bio balls. Prevents fine particles from clouding your water or damaging your pump impeller. Crystal clear water with zero media spillage. 【Universal Compatibility - All Filter Types】Compatible with bio balls, activated carbon, zeolite, peat fibres, ammonia removers, gravel with ceramic rings. Suitable for canister filters, sump systems with hang-on-back filters. One versatile bag set for all your aquarium filtration needs. 【Reusable & Easy to Maintain】Simply rinse under tap water with air dry - ready to use again.Sturdy construction withstwiths repeated filling, emptying with washing. Long-lasting with economical, reducing waste from disposable filter cartridges. A smart investment for any aquarist.