MaSa took over Stage 5 in SWTP9 in 2014; it is an additional 72,000 m3/day treatment capacity with a biological process, anaerobic system (Digester) and sludge-dewatering unit. The two digesters have a total capacity of 16,050 m3 and perform to reduce the sludge production by 20%. MaSa is the first operator in Saudi Arabia to operate this kind of sludge advance treatment.