Compost tumblers are a great idea: instead of having to lift your compost with a compost fork to turn compost by hand, a tumbler lets you just give it a spin, and it all gets mixed and tossed like a salad. Tossing it frequently like this speeds up the composting process.
But not all tumblers are the same. The problem with many of them is that they are just too big. Compost is very heavy. It takes a lot of force to rotate a 55 gallon (or bigger!) drum that is half full of wet compost, sitting high off the ground on a shaky stand. Don't buy these.
A single-batch compost tumbler that is on a ground base with bearings is a much better design. They are stable and big enough to handle a lot of kitchen scraps. They work really well, but you still have to stop adding stuff at some point to let the scraps finish and turn into compost. If you keep adding stuff, you'll always have fresh stuff in there. What do you do with your scraps while you're waiting for the compost to finish?
A dual-batch compost tumbler solves two problems. First, because they are split, each chamber is light enough to be easy to turn, and because there are two you can still make plenty of compost. Second, when one side is full you can stop adding stuff to it so it can fully break down, while you start use the other side as the active bin. These are ingenius!
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