“Pretreatment” means the reduction of the amount of pollutants, the elimination of pollutants, or the alteration of the nature of pollutant properties in wastewater prior to or in lieu of discharging or otherwise introducing such pollutants into the POTW. The reduction or alteration may be obtained by physical, chemical or biological processes, process changes or by another means, except by dilution as prohibited by 40 CFR Part 403.6(d) and this title. Where wastewater from a regulated process is mixed with unregulated wastewater or with wastewater from another regulated process, the wastewater discharge from the equalization facility must meet an adjusted pretreatment limit calculated in accordance with 40 CFR Part 403.6(e). (Ord. 22-42 § 19, 2022; Ord. 92-22 § 2, 1992; Ord. 84-105 § 1, 1984.)