$20 Calculate Biological Oxygen Demand (BOD) Mg/L Enroll Now $20 Calculate Mg/L Mixed Liquor Suspended Solids (MLSS) Enroll Now $20 Calculate Waste Activated Sludge (WAS) Pounds Enroll Now $20 LBS Sol. Exact Gal Enroll Now $20 Dry Lime in Slurry Enroll Now $20 LBS Chem. in Tank Enroll Now $20 LBS to GALS of ALUM PER DAY Enroll Now $20 LBS C O D Add Aeration Enroll Now $20 Chlorine Use 1 Yr Enroll Now