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-Flo's dry, odorless crystals. Within 60 seconds, even the most difficult drain blockage in a small drain is cleared. Insta-Flo's non-acid formula will not harm fine fixtures, porcelain, chrome trim, polished brass, plastic or metal pipes. Safe for fixtures and safe for drain lines Cleans drains, grease traps and septic systems Also use for septic tank maintenance Activated by hot water only