Model: AWB-200; jetting volume: 10 L/min; recommended air pump power: > 4 W; standard ID airline tubing: 3/16 inch. Ideal for DWC buckets, fish tanks or aquariums. 2 Bubbles Effects: Produce a cascade of fine bubbles under less air input and medium bubbles under strong input. Both form a rectangle bubble wall to increase oxygen level in your aquarium. Stable in Water: Each bar measures 8" L x 1.5" W and weighs 2.7 oz. Come with an extra suction cup clip which keeps it lying steadily without floating in the water. Reliable Material: Compressed with sand and wrapped with a plastic base, it causes no effect to the health of your aquatics. Help keep fish or roots growing healthily. Easy to Use: Soak the stone completely in water for 1 hour before use. Clean it regularly with a brush as it gets clogged after weeks or months of usage. Micro bubbles dissolve more oxygen into water and burst peacefully on the water surface. An abundant cascade of tiny bubbles is ideal for fish, betta, shrimp, and all kinds of aqua creatures. Come with an aquarium suction cup to avoid stone floated on the water.