drainage a to z
A clay device located in a domestic drain that was installed in thousands of homes from 1870s to 1930s to prevent sewer air or rats from entering the property. This was in the belief that Cholera disease was spread through the air and that rats couldn’t swim. Wrong on both counts! They are very prone to blocking and serve no purpose. Also known as Bristol interceptor or Croydon trap!
A covered tank usually below ground for storing sewage. They need regular emptying as the system is not subject to bacterial decomposition. Properties not connected to the main sewer typically use these, but septic tanks are now preferred as cesspool emptying costs have risen.