Fresh basil is produced sustainably on the roof of Rewe's Green Farming store in Wiesbaden. Water and plant nutrients are provided by aquaculture. The aquaponic farm system, which is used to grow 800,000 basil plants and 20,000 cichlids per year, is operated by ECF Farmsystems. An oxygen generator from Inmatec, which produces pure oxygen from the ambient air, ensures the necessary oxygen saturation of the water used in aquaculture.