The official Bounceback website says this:
"Bounce Back is a unique blend of organic materials specially formulated for all your fertilising needs. A highly concentrated natural product, Bounce Back also promotes faster, healthier, sustained growth for all plants. It encourages the development of earthworm and microbial activity leading to healthy, well-structured soils.
Bounce Back is composted and steam treated and is then pelletised for easier and cleaner handling. These processes stabilise the nutrients, maximise nutrient availability and ensure the product is free of any parasites, pathogens and weed seeds. Most importantly, the resultant product retains the microbiology necessary to provide a ‘living’ food
But it doesn't say what exactly is in it....makes one wonder....