I've two of those actually. They work quite well. It's amazing the quantity of garbage it actually takes to fill it. It can be like 6 months with stuff going in and in and in and the next time you see it it's still on the same level (and no, it doesn't flow down). It just gets more and more thin and "composted".

Arkansawyer

Treat it like a Starter yeast mixture.

And an easy way to get rid of kitchen slop.