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. THRIFT will liquefy hair and grease in less than 60 seconds! HOT water activates THRIFT's dry, odorless crystals. Within 60 seconds the drain is clear - even on the most difficult drain blockage. Thrift is also great for sewer lines, grease traps and septic systems. THRIFT's non-acid formula will not harm fine fixtures, porcelain, chrome trim, polished brass, plastic or metal pipes. Try THRIFT. It works. Thrift™ Acid-Free Drain Cleaner, 1 lb, Flakes, White, Odorless, 13.8, Composition: Sodium Hydroxide