Great to see. Looking forward to progress! Here is a great read on the subject: Toxic cyanobacteria in water: A guide to their public health consequences, monitoring and management, at http://www.who.int/water_sanitation_health/resourcesquality/toxicyanbact/en/ . 

Alum is discussed in Chapter 9. REMEDIAL MEASURES,  http://www.who.int/water_sanitation_health/resourcesquality/toxcyanchap9.pdf