actual solid retention time
adjusted retention time
apparent retention time
corrected retention time
corrected retention time corrected retention time
effective hydraulic retention time
gas chromatographic relative retention time
gas chromatographic retention time
general sludge retention time
Hydraulic retention time
hydraulic retention time HRT
Hydraulic retention time Sludge load
hydrolic retention time HRT
identification by retention time
most optimal retention time
nutrient-lapsed time retention