AQUA DESIGNER is one of the standard design programs for activated sludge plants in Germany and worldwide. The range of tools has been extended over the last few years to all important procedures and procedural stages. Sand trap as ventilated sand and fat catcher or round sand trap. Primary clarifier as rectangular or round basin. Aeration as continuous flow or SBR with common container shapes. Sludge treatment as anaerobic treatment or aerobic stabilization.