To verify the purification effects of the magnetic coagulant, new algae are introduced to the processed sample treated with magnetic coagulant (Fig. 6). The new solution is cultured in a light incubator at 25–28 °C with a light intensity
of 2,200 lx and dark cycle ratio of 12:12 h. The solution was mechanically shaken three to four times during daytime every day. All algal cells were observed to be dead in the precipitate after a week (Fig. 6c). The new solution obtained after magnetic coagulants treatment has conditions that cannot
allow algae to survive. Thus, the possibility of bloom reoccurrence is close to zero.