EatOils™ SUPERFLOW™ Liquid Drain Opener / Treatment is a HEAVY DUTY DRAIN OPENER that is GREENER-CHOICE™ APPROVED GREEN - this safe yet powerful drain opener outperforms others - it unclogs drains fast! And it won't harm pipes or septic systems. When a plunger just isn't enough . . . Compare and you'll see that this product is not only safer for your drains, but you will find it is more cost effective than alternative drain openers - 4 ounces down your drain at night vs. a whole bottle of product from the competition. Why pay $$$ for a plumber to come and inspect your plumbing when you can clear the clog yourself with SUPERFLOW™?