The book is divided into four chapters. Chapter 1 describes the potential of ferrocement as a construction material, and the problems of design in septic tank and aqua-privy systems. In Chapter 2 the various technical options in low-cost sanitation are contrasted and compared.Chapter 3 gives details of how septic tank and aqua-privy waste treatment and soil disposal systems are designed and constructed, and Chapter 4 gives step-by-step construction details of a ferrocement septic tank built for the commercial market.