The Tumbleweed Pet Poo Converter consists of two sturdy nesting boxes with a lid, which form a neat, compact portable unit. The worms eat and breed in the top box. This has a perforated base to allow any liquid waste to drain through to the bottom (collector) box. The "worm poo" or worm castings remain in the top box and can be harvested as desired. The bottom or catcher box collects the valuable liquid waste which can be diluted and used as a fertilizer on your garden.