OOOH OOOH I might be able to help now

I just visited a friends yard and he is renting out somewhere for the festival loo guys.....
They have a sea of wheelie bins, each with a tap at the bottom.Into this they bung some sawdust/shavings then a layer of hippy s**t (genuine from the festival

) then sawdust etc apparently it doesn't take long to rot down, and that's without worms! Should be super quick with worms in there

If it works with human poo, it'll work with dog poo
