The Chl-a content is an indicator of algal biomass, and the cell quantity is a major factor that causes turbidity. Thus,
Chl-a reduction or turbidity reduction can been considered as algal removal. (Divakaran and Pillai 2002). We used Chla
and turbidity removal rates (100 % or almost 100 %) to prove that the magnetic coagulant is effective in reducing
algal blooms. The treated suspension shows an increased COD removal rate, indicating that the magnetic coagulant
can effectively reduce the organic matter level, whereas the decrease in organic matter causes UV–Visible light absorption
reduction.