From Gardener's Supply (

All About the Worm Factory

Let worms transform your kitchen scraps into nutrient-rich organic fertilizer with the Worm Factory, an efficient, multi-tiered composter. Worms start at the bottom and migrate upwards as they go, leaving behind tray after tray of rich compost. A reservoir at the bottom captures "worm tea" — an ideal, odor-free liquid fertilizer. The kit includes all the accessories you need to get started; worms sold separately.