Roebic Septic Tank Treatment contains anaerobic spore-bearing bacteria that have been carefully selected, conditioned, and cultured specifically for use in septic tanks. These bacteria are resistant to soaps and detergents and continuously produce enzymes that digest proteins, helping to keep tank contents liquid and preventing the over-accumulation of organic waste. With just a single treatment, this product is to prevent clogging for an entire year. It is to use 1 quart for every 500 gallons of tank capacity once a year. Available in convenient bottle sizes, Roebic Septic Tank Treatment is an effective and easy solution to maintain the health and efficiency of your septic system.