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Lincoln Memorial Reflecting Pool Algae Problem Returns (VIDEO)

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WASHINGTON -- Despite the National Park Service's best efforts, Lincoln Memorial's newly reconstructed Reflecting Pool has filled with green algae.

WTOP-FM reported on the problem last week, noting that the NPS was "boosting the amount of ozone added in the filtration stage, and have already seen the water quality improve."

The reflecting pool underwent a $34 million reconstruction that concluded in August, which included building a new foundation in addition to a filtration and drainage system that circulates water to and from the Potomac River.

As The Washington Post reported Tuesday:

[B]ecause the pool is a smaller and shallower water source, the algae cells bloom more easily there.

"This is a direct consequence of the fact that this is a green project," [NPS spokeswoman Carol] Johnson said. "The conditions are pretty good for algae, once it gets in there."

There are no water-quality, health or safety concerns because of the buildup of algae, and the pumping and circulation system is working properly, Johnson said.

Once ozone levels in the pool are fine-tuned, the NPS plans a one-time removal of the algae, much of which has died and sunk to the bottom of the pool, the Post reported.

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