Receipts from selling chemicals or reagents used in treating oil wells for purposes of inhibiting or removing scale or corrosion, removing paraffin deposits and breaking down the oil-water-sludge demolition into separate components are not receipts from selling chemicals or reagents for use in acidizing the wells pursuant to Section 7-9-65 NMSA 1978. However, receipts from selling these chemicals or reagents in lots in excess of eighteen tons may be deducted from gross receipts pursuant to Section 7-9-65 NMSA 1978.
N.M. Admin. Code § 3.2.223.10