In case of less waste water volume we recommend to use an evaporator system. The developed waste water can be evaporated in the closed waste water treatment plant in a special evaporator. After this it will be condensated and the residual sludge concentrate will be led into a separate tank. The distillate water will be supplied back to the pre-treatment plant, that’s why this system is called as “close system”. In this case there is no waste water to drain.