I made my own airater by drilling holes in a 1 1/2 pvc pipe and weighting it down so it floats 12 inches below the surface of the water.I have it in a 4inch pvc pipe that is app 4-5 feet long with holes drilled into it to cut down on turbulace in the tank that is suspened verticaly in my single chamber sepic tank. I also have the air split so it goes to the water outlet to bubble there and i installed a timer to let things settle in the tank.
I have used the oxyclean but just 2 scoops a day.