The technologies vary in cost, weight, size, ease of use, durability, taste quality and more.
The material is effective in wastewater treatment for several key reasons.
Microcystin is the most common type of cyanotoxin, a group of chemical contaminants formed by blue-green algae.
The adsorptive capacity of GAC makes it ideal for removing a variety of contaminants from water, air, liquids and gases.
That agency said that early sampling results showed that lead-removal filters are working as expected in Flint homes with high lead levels.