MBBR technology is a highly effective biological treatment process used in wastewater treatment, aquaculture, and various industrial applications, offering benefits such as improved effluent quality, operational efficiency, and cost-effectiveness. Notable successes include Malaysian aquaculture company ，Customer Requirement:The aquaculture pollution caused by high-yield aquaculture will exceedthe self-purification capacity of the crab pond itself, which will seriously effect the increase in the yield, quality and efficiency of crab breeding in the pond.We use AquaSust MBBR process reconstruction scheme as follow.Put the AquaSust MBBR into the breeding circulating water equipment.then Reduce nitrate accumulation in circulating aquaculture system andreduce water eutrophication