The vault hole is 2.5m long x 2m wide x 0.85m deep. The vault sits in the hole and acts as the foundation for the shed bit. It's very neat.
The vault is divided into two - so one side is in active use for a year and the other side is composting for a year. So - instead of moving the hole, you move the toilet pedestal from side to side on an annual basis.
You have to put a handful of sawdust or any "brown" material after each visit. There is a urine separator for the ladies and a urinal for the chaps. We haven't had the urinal fitted yet but I am planning to have that routed straight to my woodchip pile.
There are two other holes in the vault which are only opened to shovel the composted waste out at the end of its composting year.
I think this is one of the first "private" toilets that Natsol have installed. They usually go to public places, allotment sites, churches etc. and they are popular with the public.
We won't be using newspaper for loo paper but we will be switching to an unbleached toilet paper brand. Can't quite bring myself to use straw
We didn't get planning for this. Natsol have a document of cogent arguments on their website as to why planning isn't required.