1. How a septic tank works. By: Healthabitat Australia (0:52 minutes)
  

2. Construction of Septic tank and soak pit as per Tamilnadu Government procedure Tamil (8:08 minutes)
  

3. Septics 201 Chapter 2: Septics Overview (1:02 minutes)
  

4. Septics 201 Chapter 3: System Types (1:46 minutes)