Has anyone ever used one of these to unblock a shower drain?
http://imgur.com/nCRamab
http://imgur.com/nCRamab
http://imgur.com/nCRamab
http://imgur.com/nCRamab
any reason you would not pour Mr Mussel down the drain, like everyone else does?

any reason you would not pour Mr Mussel down the drain, like everyone else does?
It did the trick. Dragged up a big wad of gunk and long hair.
But forgot to o-ring back on when screwing the plug assembly back together. nearly flooded downstairs having a shower before I realised.
Lesson learned. Call a plumber.