ROETECH 103 is a highly concentrated spore mixture of three patented Bacillus bacteria. The blend exclusively contains bacteria which can grow over a wide temperature range of 5°C to 55°C. Applications for ROETECH 103 include wastewaters which have either unusually low temperatures or unusually high temperatures or wide fluctuations in temperature. Examples include aeration basins, lagoons with seasonal temperature fluctuations and pretreatment of food processing wastewater. ROETECH 103 is also ideal for use as a biological accelerator in composting.