US lawIllinoisRegulationsTitle 35 — ENVIRONMENTAL PROTECTIONCHAPTER II: ENVIRONMENTAL PROTECTION AGENCYPart 370 — ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKSSubpart K370.110035 Ill. Adm. Code 370.1100ApplicabilityYear: 2026Length: 20 wordsOfficial source Section 370 Section 370.1100 Applicability Various types of tertiary filters may be used to polish effluents of secondary treatment plants.Next35 Ill. Adm. Code 370.1110