Be Green Compost Maker for Grass 500ml. Specifically created for rapid composting of grass into a high quality compost. 10ml of Compost Maker, mixed with a full watering-can, treats about one-&-a-half bin bags of waste. Compost ready for use after ten weeks of rotting. Can be used to re-activate partially-composted or dead heaps. Suitable for use in all types of compost bins