Septic Processes & Problems
Anaerobic Bacteria
Anaerobic bacteria are microorganisms that live and function without oxygen. They are the primary biological workforce inside a septic tank, breaking down organic waste through a process called anaerobic digestion. This process reduces the volume of solids in the tank, produces gases (primarily methane and hydrogen sulfide — the source of septic odor), and converts some organic matter to carbon dioxide and water. Without anaerobic bacteria, a septic tank would fill with solids much faster.
Anaerobic bacteria are naturally present in human waste and establish themselves in a septic tank automatically. They are killed or suppressed by antibiotics (in large doses), harsh disinfectants, bleach, and certain medications that pass through the body. While a single antibiotic course will not sterilize a tank, large household doses of bleach or industrial cleaners flushed regularly can reduce bacterial populations and tank performance.
What This Means for You
You do not need to add commercial septic additives, enzymes, or bacteria products to your tank — a healthy tank already contains everything it needs. What you should avoid: dumping large amounts of bleach, chemical drain cleaners, or disinfectants into your drains. These products kill the bacteria your system depends on and accelerate solids accumulation.