Accelerator Spray by Urban Composter The secret to the Urban Composter is the revolutionary Compost Accelerator spray. This uniquely formulated spray contains Effective Microbes (EM1) that break down your leftover food, kitchen peelings and other organic waste. The Compost Accelerator Spray replaces messy Bokashi Bran in the Urban Composter. Urban Composter Compost Accelerator is sprayed on to the scraps which assists the break down and fermentation of the scraps in the bucket. Easier to use than traditional bokashi bran, the Compost Accelerator spray comes in a 500 mL bottle that is clean, quick and simple to use. The Urban Composter composts using an anerobic composting process which means that the food scraps dont rot or smell while breaking down.