Lees Discard A Stones Coarse Bubble Diffuser is an essential aeration tool for both fresh and saltwater aquariums. It features a reusable design with disposable inserts, making it easy to maintain optimal water conditions in your tank. Creates large bubbles ideal for high-oxygen environments. Reusable design with disposable inserts for convenience. Safe for use in under gravel filters, corner filters, or as decorative elements. Excellent for enhancing biological filtration and oxygenation of aquariums. Compatible with both freshwater and saltwater setups. Includes 100 coarse stones per pack. Reusable air diffuser inserts included. Ideal for various filter types including under-gravel filters, corner filters, and more This product is best suited for aquarists looking to improve oxygenation and filtration in their aquariums.