In this subdivision:
I. "Household cleansing product" means any product, including but not limited to, soaps and detergents used for domestic cleaning purposes, including, but not limited to, the cleansing of fabric, dishes, food utensils and household premises.
II. "Phosphorus" means elemental phosphorus.
III. "Trace quantity" means an incidental amount of phosphorus which is not part of the household cleansing product formulation, is present either as a consequence of manufacturing, to assure product performance for purposes other than cleansing, or to assure container stability, and does not exceed 0.5 percent of the content of the product by weight, expressed as elemental phosphorus.