No gray water disposal possible.

The photos are good, but the descriptions are unclear. At the roundabout on the east side of the highway, you should drive directly into the parking lot. The cistern for the waste water tank is located on the right in the toilet block behind a door. Looks like a regular toilet

Great sani place. Free water with your own watering can. You can stand there for a maximum of half an hour. Coordinates are correct. So it's NOT at the gas station for those who couldn't find anything