>>389005No, he means literal toxins. Like the kind some (not all) species of Cyanobacteria make.
http://www.ecy.wa.gov/programs/wq/plants/algae/publichealth/generalcyanobacteria.htmlMany of them are long lasting and stay in the water after an algal bloom has naturally faded.
Drink running water or rain puddles.
Pic unrelated; those aren't the type of toxins we're taking about.