Compost bins are the most traditional devices used when composting. Compost bins range in different sizes and shapes. Compost bins are effective for the most passive and active composter. With so many compost bins available it is hard to choose one that suits your needs. You could use the most expensive bin in the market or just an ordinary box. All that you need are the correct conditions for decomposition to occur.
These conditions would be moisture, aeration, surface area and temperature. The compost bin needs aeration. It needs oxygen to get into the center of the pile to help the microorganisms breakdown the material. The compost bin should be able to retain a certain amount of moisture. Too much moisture and it will leach the valuable nutrients from the compost. Not enough moisture will slow down the decomposition. Surface area is important, but this is also dependent on the size of the material you place in the compost bin. Finally the compost bin should help maintain the temperature within the compost pile. Higher than normal temperatures are usually present within the compost pile. As the temperature drops the rate of decomposition slows down.
Most households that compost use a one bin system. With a one bin system the older more decomposed material will reside at the bottom of the pile. If you need the compost from the bottom then just take the newer material off the top of the pile, use what you want then put the material back on top and let it continue to decompose. This system could be slow and not produce a lot of material quickly.
Now if you need more compost than one compost bin can supply you could use a two or three bin system. What this allows you to do is allow one bin to decompose completely while you add new material to the other bin or bins. This way you will not slow down the decomposition process by interrupting it to take out material. In both systems you will still need to turn and mix the material inside the compost bin approximately every day or two. This can be done with a pitchfork or shovel.