Not Approved Downloads folder for Not Approved https://www.tceq.texas.gov/downloads/permitting/ossf/products/treatment-system/not-approved https://www.tceq.texas.gov/@@site-logo/TCEQ-1072x1072.png Not Approved Downloads folder for Not Approved Southern Aerobic Systems Approved Product Treatment PL-500, PL-500-2X Approved Product Treatment AD-500 Approved Product Treatment