The Hiblow septic air diffuser was specially designed for Hiblow aerators. The pour size on the diffuser is more porous reducing back pressure on the aerator. Having a larger pour size also allows for an extremely long time between needing to be changed. Flow is 80 liters per min most systems us two diffusers in them. Micro bubbles are a perfect size and distribute the oxygen needed in any environment perfectly. The diffuser is ideal for use in septic or pond aeration.