Sewage sludge boat Garroch Head on the River Clyde at Shieldhall Sewage Works in 1987. In the old days it was possible to get a free day trip on a sludge boat "doon the watter" to the Firth of Clyde, into which the sewage was discharged . The Garroch Head was the last sludge boat and this practice ended in 1998. Scanned from a transparency taken by David Palmar.
