From 2012:
The Post reports that algae has quickly bloomed in the new Reflecting Pool—some on the surface, some on the bottom—making it look like pea soup in some areas. The algae is blamed on a change in the source of the water—it’s being drawn from the Tidal Basin instead of from D.C. water reservoirs—a shallower pool that allows algae to bloom more quickly and some fine-tuning that has to be done on the amount of ozone in the water:
However I am told that city water was used this time.
The Post reports that algae has quickly bloomed in the new Reflecting Pool—some on the surface, some on the bottom—making it look like pea soup in some areas. The algae is blamed on a change in the source of the water—it’s being drawn from the Tidal Basin instead of from D.C. water reservoirs—a shallower pool that allows algae to bloom more quickly and some fine-tuning that has to be done on the amount of ozone in the water:
Lincoln Memorial Reflecting/Algae Pool Looking Better After Costly Renovation | DCist
Despite a $34 million renovation, algae blooms have started appearing in the Lincoln Memorial's Reflecting Pool.
dcist.com
However I am told that city water was used this time.
