in 1969. Originally, it was simply a liquid lye (sodium hydroxide). In the late 1970s, the product was reformulated as a combination of liquid lye and sodium hypochlorite. Sodium hypochlorite is used in low (5%) concentration as laundry bleach and in higher concentrations as a swimming pool disinfectant. Liquid Drano is marketed in several forms, including Drano Liquid Clog Remover, Drano Max Build-Up Remover, and Drano Dual-Force Foamer Clog Remover. All are variations on the basic Liquid Drano formula. Drano Foamer Drano Foamer first started out a powder similar to Crystal Drano in which water had to be added. This was the first-ever foaming pipe snake product. This caused Liquid-Plumr to launch Liquid-Plumr: Foaming Pipe Snake, which is a 2-in-1 liquid. Many years later, the makers of Drano decided to reimagine Drano Foamer as a 2 in 1 liquid known as the Dual Force Foamer. Drano Kit The Drano Snake Plus Drain Cleaning Kit combines a mechanical snake for loosening clogs, with yet another gel-variation on the Liquid Drano formula. See also Liquid-Plumr, another comparable drain cleaning brand by The Clorox Company. References External links Official site NIH Household Product Database entry FTC order Products introduced in 1923 Drano Drano