ABSTRACT
Other important value-added products include fragranced laundry bleaches like those that appeared in Canada about 1982 and in the United States in 1983. Liquid automatic dishwasher detergents with 1-2% sodium hypochlorite were introduced in the United States in 1986. Originally these were opaque suspensions, but since 1991 clear, polymer-thickened gels have also been sold. One of the first value-added products was a liquid drain opener introduced in the United States in 1970 as a safer alternative to strong acids and bases. Its rheology was improved in 1990 to make it possible to pour the product through standing water without mixing, and thus to develop a higher concentration of hypochlorite at the clog.
