B.O.S.S.- Bio-Safe Organics Septic Solution & Drain Care 12.5 oz Powder – Patented Bacteria Enzyme Exxon Valdez Septic Tank Maintenance & Drain Care Formula, All Septic Tank Systems & Drains – 3 pack

Customers find the drain opener effective, with one mentioning it left their drain working like new. Moreover, the product receives positive feedback for its quality, safety, and ease of use, particularly noting it's safe for pipes and easy on septic systems. Additionally, customers report improved water flow, with one mentioning their sink flowing freely and another noting clear drywell pit water.