Over here in NZ, we are in the grip of winter.
Products like these tend to show up from time to time.

Have a look at this:

Smartburn

From what I can see, this is a bit of galvanised steel pipe squashed at the ends and it is supposed to hold some "magic" substance that cleans your chimney and makes your fire burn more efficiently.

I fail to see how this works if at all.

Your thoughts?