RAS system unit integrated into feed container, designed for new or existing land-based aquaculture facilities. The container possesses two RAS units, each consisting of mechanical filtration (drum-filter), trickling filter and pumping units with a capacity of 65 m3/h each. The water of the drum-filter is collected in a reservoir and is pumped to the CO2 degasser. After the degassing, the water flows by gravity to the reservoir, where it can be bypassed by the drum-filter sump. The units have UV filters with the corresponding transmutation level of the UV which is set at 85% T10 50 mj/cm2.