Ruinemans Aquarium B.V. wants to upgrade their current cold water RAS systems for ornamental fish. In this second update we have combined 12 separate RAS systems into one modern RAS systems with the latest filtration techniques. The sedimentation filters have been replaced by a Hex drumfilter. We have added a large VGE UV-C device and optimized the pump capacity. This means that we not only reduced the labour but also the energy consumption. There are 18 systems left to upgrade, which are planned for next year. To be continued.