CFR > Title 40 > Chapter I > Subchapter N > Part 436 > Subpart O CFR > Title 40 > Chapter I > Subchapter N > Part 436 > Subpart O – Sodium Sulfate Subcategory Current as of: 2024 | Check for updates | Other versions § 436.150 Applicability; description of the sodium sulfate subcategory § 436.151 Specialized definitions § 436.152 Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available