An overfilled septic tank can cause backups in a sewer line,
causing many problems in a plumbing system. If a septic tank has
overflowed, it is usually clogged with excessive organic
debris.
A septic tank cleaner can be a good first step when treating a
septic tank overflow. Septic tank cleaners contain natural bacteria
and enzymes, designed to break down organic material in human
waste. Excessive disposal of bleach and detergents into a septic
line can kill these bacteria, preventing the breakdown of septic
waste in a tank. If a septic cleaner doesn't clear a tank after a
week, it may be necessary to use a professional septic tank
cleaning service.