| 1. Effect:- Enhance alga growth effectively- Increase dissolved oxygen; decrease a large amount of toxic gas such as H2S, NH3.- Increase ability of organic disintegration; decrease COD, BOD. - Reduced volume of mass sludge; eliminate bad smell of sludge at the bottom of pond.- Stabilize color of water and pH.- Specially: recover the microorganism systems at the bottom, regenerate nutrition for feeding pond. | 
