Can you tell what it is yet?

Putting this together has been very, very satisfying. It seems I've not quite grown out of meccano. There are a few more bits and pieces to add yet, but once it's finished it'll be a biodiesel reactor.

Add used chip shop oil and a bucket of chemicals, leave for a few hours and (with some luck) out comes diesel. It should be good enough for running the truck and heating the caravan and will cost quite a bit less than normal diesel. Best of all though, it's carbon neutral - recycled fuel made with recycled plumbing.