Original Design. The Worm Factory's stackable, multi-tray design makes it the most efficient worm bin composter around. Worms begin eating kitchen waste in the lowest tray, and then migrate upward in search of food. Use it indoors or out.
Once the worms have finished your original trays, add another tray with fresh material. The worms will migrate up as they finish the lower tray and find your newer kitchen waste and tray components. As many as 8 trays can be used over the sturdy base.