Pretreatment standards for existing sources (PSES).

Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for existing sources (PSES): Subpart A—Aluminum Chloride Pollutant or pollutant property PSES limitations pH Within the range 5.0 to 10.0.