"What about filters? Even filters such as Berkey filters have their limitations. They are capable of filtering pathogens and microorganisms, but getting rid of a cyanotoxins is a different story."
What I understand, its only water from Lake Erie via the city system. so lake or pond water thru your Berkey filter would be safe. (there is a way to use only the Berkey filter elment and make your own system with 5 gal buckets...'V')