本发明涉及一种方法，用于由至少一个超滤和/或微滤和超滤后的装置通过至少通过了旁通处理循环水在再循环系统，特别是在水产养殖再循环系统，其中至少所述循环水的部分流，并且在所述旁路制备 和/或微过滤被引导回至循环水，其中，所述部分流的质量流量作为循环水参数的水质的一个或多个特性的函数的控制发生。

The invention relates to a process for treating the circulating water in recirculating systems, in particular in recirculating systems for aquaculture, wherein at least a partial stream of the circulating water through at least passed a bypass and prepared in the bypass by means of at least one ultrafiltration and / or microfiltration and after ultrafiltration and / or micro filtration is led back into the circulating water, wherein the control of the mass flow of the partial stream as a function of one or more characteristic of the water quality of the circulating water parameter occurs.