Soap, drain solvents, and other mild cleaning or disinfecting solutions
used for normal household purposes cause no trouble in the tank.
Constant use in large quantities, however, and disinfected wastes from
the sickroom may prove harmful.
Wastes from milk rooms, strong chemicals used in sterilizing equipment
or in photographic work, and the wastes from filters or water softeners
not only reduce bacterial action but also cause abnormally rapid
accumulations of sludge and clogging of the tile lines.