Designed for maximum efficiency, these innovative diffusers maximize circulation and oxygen transfer by moving more water with less energy. The secret is in the innovative diffuser tubing, an extruded EPDM compound that offers tremendous longevity and resistance to fouling. Bubble sizes that decrease as pressure rises maximize surface area for extremely efficient gas diffusion. Sizing your aeration project is easier than ever before, with diffusers to accomodate every depth and profile. Easy to fill with any onsite sand or gravel