Drano (styled as Drāno) is an American brand of chemical drain cleaner that is manufactured by S. C. Johnson & Son.
Crystal Drano
According to the National Institutes of Health's Household Products Database, the crystal form is composed of:
After Drano crystals are added to water, the reaction works as follows:
Crystal Drano was invented in 1923 by Harry Drackett. From the 1960s into the 1980s, Drackett advertised Once in every week, Drano in every drain.[2][3]
Bristol-Myers bought the Drackett Company in 1965 and sold it to S. C. Johnson in 1992. Drano has been developed into several forms; as of 2016, the original Crystal Drano is marketed as Drano Kitchen Crystals Clog Remover.