Let us start with the NatureMill and a warning, this one is so new it may not yet be sold in your country, which means shipping it from the US and that costs. Composting inside the home is a little unnatural.

At $299 (and $82.50 shipping for Europeans) it rivals the most expensive composters on the market. Wormeries, Bokashi bins and the American new kid on the block, NatureMill. As composting can be done for nothing, zero Dollars, Euros or Pounds, why on earth would you be inclined to spend this money. It's so clever that it tells you when.

The microbes required for decomposition are ruthlessly excluded from many homes (OK, not mine but housework only becomes attractive as displacement activity round here), so how can we get a nice decay friendly atmosphere going on inside without introducing microbes that we don't want rampaging around the kitchen. NatureMill is a self contained unit, with an air filter to deal with smells and that processes your food waste in as little as two weeks. The NatureMill is not a cheap option either.

Essentially there are three different types of compost system that can operate indoors.