This powerful commercial-grade system aerates up to 100 gallons of water. Twin outlets pump out a whopping 6.9 liters of air per minute. For freshwater or saltwater use. Includes two weighted 3" bubble donuts, tubing and two replacement diaphragms. Produces 99.5% saturation of dissolved oxygen Complete ready to use systems Weighted glass bead air stones, and silicone airline tubing included Every unit is tank tested to assure quality No batteries required
