Minn. Stat. § 116.23: PROHIBITION AND RESTRICTIONS.

Subdivision 1. Nutrient concentrations.

No person shall manufacture for use or sale in Minnesota or import into Minnesota for resale any cleaning agent or chemical water conditioner which contains a prescribed nutrient in a concentration that is greater than the prescribed maximum permissible concentration of that nutrient in that cleaning agent or chemical water conditioner.

Subd. 2. Residential dishwasher detergent.

No person shall sell, distribute, offer, or expose for sale at retail any household dishwasher detergent that contains more than 0.5 percent phosphorus by weight. This subdivision does not apply to the sale or distribution of detergents for commercial or institutional dishwashing purposes.