The Green Maritime is also a ship of van de Graaf & Meeuwsen. River water is collected and cleaned on this boat. There are 2 purification lines. Line 1 is used to treat the river water so that it can be used to clean the push barges. This water is collected and cleaned again. After this treatment, the water may be discharged onto the surface.

In line 2 the river water is purified in such a way that it becomes drinking water. The crew of the ship used this water for drinking and showering.