"Victoria Clare" wrote in message
.206...
How deep are your pits usually? Is a couple of feet enough?

A couple of feet is all I can manage - we're on boulder clay and it's a mare
to dig.
I normally dig a cardboard box sized pit. Each layer of poo only needs a
sprinkling of grass to supress the pong and foil insects. As an added
benefit slugs seem to be drawn to it....