CFR > Title 40 > Chapter I > Subchapter N > Part 436 > Subpart X CFR > Title 40 > Chapter I > Subchapter N > Part 436 > Subpart X – Diatomite Subcategory Current as of: 2024 | Check for updates | Other versions § 436.240 Applicability; description of the diatomite subcategory § 436.241 Specialized definitions § 436.242 Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available