 Recycling up to 25% of the product to the digester increases biogas yields by greater than 30 % and enhances biodegradation, reducing output of biosolids by at least 20%.The Lystek system can be installed as a back end, post Anaerobic digestion, post dewatering solution at the wastewater treatment plant.It can also take raw sludge directly without an anaerobic digester process.