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Photosynthetic Bacteria Closes Seattle's Green Lake
"Toxic Algae Forces Closure of Green Lake" (Seattle Post-Intelligencer)
"The waters of Green Lake in recent weeks have deteriorate into a
murky, pea-green gruel, the result of the pollution-aided and explosive
growth of a toxic bacterium that is commonly -- though inaccurately --
dubbed "blue-green algae....
"In 1991 city crews spread 181 tons of
aluminum sulfate, more commonly
known as alum, into the lake. Alum
binds up the phosphorus and makes it
unavailable to fuel the growth of the
algae. Officials said the alum treatment
would retard the growth of the
Aphanizomenon for about five years."