The Can-O-Worms Working Tray can be used to replace a damaged tray, or it can be added to your worm farm in addition to your existing trays. Adding an extra tray to your worm farm will allow your worm population to grow.
Can-o-worms from Tumbleweed comes with 2 working trays. We recommend using a third tray as then more of the worms will have left the bottom tray, which means you can use the castings from the bottom tray sooner.