Cover: The bin should have a cover to prevent light from getting in and to prevent the compost from drying out.

The maximum productive depth for your bin is 24 inches (61cm) deep because composting worms will not go further down than that.

Estimate 1 pound (0.45kg) of worms for every square foot of surface area.

Size: The larger you make the container, the more worms it can sustain.

Untreated wooden bins are naturally ventilated because of structure of wood. For example, you can build a worm bin out of a large plastic tub with several dozen small holes drilled out on the bottom and sides.

Ventilation: Your bin should be well-ventilated, with several 1/8 inch (3mm) holes 4 inches (100mm) from the bottom (otherwise the worms will stay at the bottom of the bin and you may drown your worms).Clean the 5 gallon (18.9 L) buckets thoroughly with soap and let them sit for a day or so filled with clean water before using as a worm bin. 5 gallon (18.9 L) plastic buckets now for sale by most hardware stores can be used - especially if you live in an apartment. Just don't use chemically-treated wood, which may be dangerous to worms or leach harmful chemicals into your compost. Some people prefer wooden compost worm bins because they may breathe better and absorb excess moisture, which can be hazardous to the worms. Wood will eventually be eaten, and plastic cracks easily, but either will do in a pinch. Galvanized tubs are somewhat costly but will last forever. Material: Rubber is cheap, easy to use and durable.government agency responsible for promoting safe environmental practices Go to source X Trustworthy Source United States Environmental Protection Agency Independent U.S. Use rubber storage totes, galvanized tubs, wood, or plastic. If you don't want to buy a worm bin, you can also build one on your own.

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