Ill. Admin. Code tit. 35, § 223.285
b) Compliance with the requirements of this Subpart may also be demonstrated through calculation of the VOM content from records of the amounts of constituents used to make the product pursuant to the following criteria:
3) For subsection (b)(4), the following shall apply:
4) For the purposes of this Section, the VOM content shall be calculated by subtracting the total weight of VOMs exempted under Section 223.230 per unit from the total weight of all VOMs per unit, divided by the total net weight of unit excluding container and packaging and the product, multiplied by 100 as in the formula below:
