Diffusers and air stones deliver oxygenated bubbles from an air pump to the water in your grow system or reservoir, but they do much more. When nutrients are in the water, air stones and diffusers help to circulate them, increasing growth potential for your plants. Nutrient solutions will last because they will stay healthier longer with more oxygen. Choose from cylindrical-shaped round air stones or flat discs, both in varying sizes. Growershouse has diffusers capable of aerating as little as 20 gallons and as much as 250 gallons. Diffusers and air stones also help to maintain water temperature.