Bob Eager wrote:
On Sat, 10 Jun 2006 11:28:28 UTC, " wrote:

Hire a drain rod set. You can get a little wheel contraption that
screws onto the head to help it through.

40 metres of drain rods????

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Yes I thought of rods and fish wires initially and then did the 'not 40
metres worth' bit.

I think I would try the vacuum cleaner idea but the sie of the pipe
rather is against that - if it is straight I would try a pig made out
of a length of dowel - say 200-300 mm - with 50mm thick polstyrene
discs which have reasonable clearance from the wall holding in place
washers of membrane grade polythene which act like piston rings and
eliminate the air past the pig thus sucking it along with the fairly
small vacuum, but large air flow from the cleaner - obviously the
largest one you can lay your hands on.

The other option would be to wash the 'string' down with oodles of
water but as the water is beyond the bottom end of the pipe still, we a
have a 'there's a hole in my bucket .... ' scenario where that idea is
concerned !

This is an interesting and somewhat unusual challenge - tell us what
the solution is please when you find one !

Rob