Arena Center in Zagreb, Croatia is the largest shopping and entertainment center in the region, covering 175,000 square meters with over 200 stores. It was completed in just 15 months with 3000 workers, making it the largest real estate investment in Europe. ACO supplied various drainage products for the project, including gullies and tray channels in the hypermarket to drain waste water from the fish market, sanitary facilities, and food preparation areas. ACO also provided watertight and odorproof access covers inside storage areas, as well as galvanized covers and plastic channels outside the building. Freestanding ACO separators were incorporated to process grease and oil waters from the kitchen and parking areas.