Algae: Helpful or harmful?
‘Algae’ is a catch-all term for a polyphyletic cluster of mostly aquatic photosynthesising organisms.
While this category includes protists and cyanobacteria that can cause harmful algal blooms, it also includes seaweed and kelp, which help cleanse and balance marine ecosystems, and thus play a role in producing clean water.
Algae is everywhere and although the vast majority of algae in drinking water is generally harmless, it’s best to be on the safe side — wash filtered-water pitchers, camping water containers and pet bowls with bleach, and keep them out of the heat and sun to discourage algal growth.
Steer clear of areas with harmful algal blooms, and always boil water from freshwater drinking sources.
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