§ 421.20 - Applicability: description of the primary aluminum smelting subcategory.

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§ 421.20 Applicability: description of the primary aluminum smelting subcategory.

The provisions of this subpart are applicable to discharges resulting from the production of aluminum from alumina in the Hall-Heroult process.

                    
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§ 421.20 - Applicability: description of the primary aluminum smelting subcategory.

§ 421.20 Applicability: description of the primary aluminum smelting subcategory.