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US law
Illinois
Regulations
Title 35 — ENVIRONMENTAL PROTECTION
CHAPTER I: POLLUTION CONTROL BOARD
Part 604 — DESIGN, OPERATION AND MAINTENANCE CRITERIA
Subpart F
Illinois · Regulations
Subpart F
2 sections
2 sections
35 Ill. Adm. Code 604.615
Deep Bed Rapid Rate Gravity Filters
35 Ill. Adm. Code 604.620
Biologically Active Filtration