Rule 2101. The purpose of this part is to prescribe certain requirements for the approval of chemicals, materials, coatings, additives, or other substances proposed to be used in the treatment or during the distribution of drinking water, or which are proposed to be used in contact with drinking water prior to, or during, distribution to the customer or user of a public water supply; and to prohibit a person from using unapproved chemicals or materials which may come into contact with, or serve as an additive to, drinking water.
Mich. Admin. Code R. 325.12101