Cajun Aire is a brand of residential aerobic septic systems associated with McGrew Construction Company, Inc., and is commonly found in the southern United States, including Texas and Louisiana.

They are typically available in standard residential sizes (around 500–1000 gallons per day) and follow a basic extended aeration design, making them comparable to other common ATUs like Jet, Hoot, or Aqua Safe systems.

These systems are compatible with most linear style air pumps (Hiblow & FujiMAC) and typically have a 1/2HP bottom or mid suction pump.  

Cajun Aire is a Registered Trademark of McGrew Construction Company, Inc