Cheap (almost free) DIY Chimnea

Forgive me for repeating the obvious but if you try this don`t forget to make sure the cylinder is empty before you do anything and after taking the valve out with a wrench not a grinder or gas torch YOU MUST FILL THE CYLINDER WITH WATER TO PURGE THE GAS.
Until you have done this you are working with a bomb, one spark and there will be a big bang.

Goes without saying. The bottles I got were empty but I still it open and venting for a week before I took the valve out. I then left it upside down for 24hours and them I filled it with soapy water and left it for 10 days or so. I also left the water inside while I made the first hole in the side just to be extra cautious.

If you google or look on youtube there are a good few guides to making one and most  give detailed instructions on getting the valve off and cutting the bottle.

Yep, but you only have to go down the local tip to see how many get handed in there - and presumably somewhere before that someone lost their deposit!!

Excellent job.