(1) No household cleaning product may be distributed, sold, offered, or exposed for sale if it contains phosphorus in concentrations in excess of a trace quantity, except that no dishwashing detergent may be distributed, sold, offered, or exposed for sale if it contains phosphorus in excess of 8.7% by weight expressed as elemental phosphorus.

(2) No chemical water conditioner which contains more than 20% phosphorus by weight may be distributed, sold, offered, or exposed for sale.

(3) The following cleaning agents and other products containing phosphorus are exempt from the provisions of this rule:

(a) those used in food or beverage processing, or used by health care services and facilities;

(b) those used by commercial establishments, and those used for industrial processes or for cleaning food and beverage processing equipment, medical or surgical equipment, or dairy equipment; and

(c) those used for agricultural operations.