Maintain your drainage and septic systems with Eco-Flow, a ready-to-use highly concentrated, microbial formulation. It's designed for optimal maintenance of aqueous environments such as: drain lines, septic systems, grease traps and interceptors where it reduces build-up, prevents back-up and keeps systems free-flowing. Recommended Use Drain Treatment: Apply 2 oz per inch of drain diameter, twice weekly or as needed. Grease Trap Maintenance: Add 16 oz per day to a drain leading to the grease trap at low usage times. Holding Tank Treatment: Add 32 oz per 100 gallons capacity at low usage times. Septic System Treatment: Add 32 oz per 500 gallons capacity once per month.