CLR Brands® Drain Opener The fast and effective way to unclog blocked sinks and tubs, slow-moving drains, double sinks, shower drains, floor drains and garbage disposals. Pressurized drain opener that safely unclogs drains in seconds without the use of harsh chemicals, acids or lye. Formulated for use in bathroom sinks, kitchen sinks, tubs, shower stalls, laundry tubs. It addresses clogs caused by hair, grease and soap scum. With up to 15 uses per can, it is an economical way to address clogs. It is harmless to sound plumbing and can be used with septic systems. Works instantly. Simply fill sink with water to submerge can's cap, place can's cap over drain opening and press firmly for one second. Repeat if necessary.