The PlanET Rotacrex is a powerful and efficient substrate preparation tool, which can be easily integrated into new or existing biogas plants. This proven shredding technology can be used to reduce the particle size of many substrates including solid manure, energy crops, food waste and other solid substrates, which can increase their biogas yield. It can optimize the substrates before they are fed into the biogas system and maximize the biogas potential of the current system and substrates.