Boyd's Chemi Bags are essential double-stitched nylon filter bags designed to securely contain various granular filter media within your saltwater aquarium's filtration system. These versatile bags effectively hold activated carbon, phosphate removers, ammonia removers, nitrate removers, and silicate removers, ensuring optimal water clarity and health. Each pack includes two durable Chemi Bags, conveniently sized at 4.5 inches by 9 inches, making them suitable for fitting into most standard sumps, hang-on-back filters, or media reactors. The robust double-stitched nylon construction prevents media from escaping while allowing maximum water flow for efficient contaminant removal. These filter bags are ideal for any reef aquarist looking to maintain pristine water quality by utilizing chemical filtration. Whether you are combating nuisance algae with GFO, removing odors with carbon, or targeting specific pollutants, Boyd's Chemi Bags provide a reliable and reusable solution for deploying your chosen media effectively.