3. The base and walls of the slurry storage tank, any effluent tank, channels and reception pit and the walls of any pipes shall be protected against corrosion in accordance with paragraph 7.2 of the code of practice on buildings and structures for agriculture published by the British Standards Institution and numbered BS 5502: Part 50: 1989(1).
(1)
The International Standard Book Number (ISBN) in respect of BS 5502: Part 50: 1989 is 0 580 172112.