The usual cause for sluggish drains is a build-up of grease, hair, soap scum or bath oils. Most drain cleaners require 2 to 6 hours (or overnight) for results. Insta-Flo will liquefy hair and grease in less than 60 seconds. Hot water activates Insta-Flos dry, odorless crystals. Within 60 seconds, even the most difficult drain blockage in a small drain is cleared. Insta-Flo is even great for sewer lines, grease traps and septic systems. Insta-Flos non-acid formula will not harm fine fixtures, porcelain, chrome trim, polished brass, plastic or metal pipes.Safe for fixtures,Safe for drain lines,Activated by hot water only,Not sold in Big Box stores