Do not, under any circumstances enter any manhole, sewer, culvert or drain unless adequate safety arrangements have been made and they are in place
The arrangements for working in confined spaces that are given on this website must be fully implemented.
If there is any sign or suspicion of rat infestation, follow the precautions against Weil's disease that are given on this website.
Take special care where chemical drain cleaners may have already been tried. Most are toxic and may cause burns.
Make sure that all equipment is thoroughly cleaned and disinfected after it has been used.