Mich. Comp. Laws § 324.3902: Phosphorus content; cleaning agent intended for use beginning July 1, 2010.

Sec. 3902.

A person shall not sell, offer for sale, or distribute for sale or use in this state any of the following:

(a) Subject to subdivision (b), a cleaning agent that contains phosphorus in any form in excess of 8.7% by weight expressed as elemental phosphorus.

(b) A cleaning agent that is intended for use in household clothes washing machines or, beginning July 1, 2010, in household dishwashers and that contains phosphorus in any form in excess of 0.5% by weight expressed as elemental phosphorus.