The AquaVita 12'' Trapezoid Air Stone helps maintain well-aerated conditions in hydroponic systems. This air stone connects to an external air pump and releases fine, evenly dispersed bubbles that increase dissolved oxygen throughout the nutrient solution. Its extended trapezoid shape provides stable placement and wide airflow coverage, making it suitable for larger tanks, grow beds, ... https://www.hydroponicstown.com/857612-aquavita-12-trapezoid-air-stone