1 Quart. Sandy Knoll Farms Compost Aid works by accelerating the decomposition of biodegradable products placed in your compost bin. This primary breakdown of materials is a natural occurring process which yields dark, rich, organic material known as humus, also commonly known as ‘black gold’. This product can then be used as a soil conditioner to rebuild and enrich plants and gardens. Compost Aid is a safe, all-organic product that works as a compost accelerator for biodegradable products in your organic recycling or compost pile.