As we wrote yesterday, the Lincoln Memorial Reflecting Pool has been drained after a losing battle with algae blooms. And as Flickr contributor His Noodly Appendage captured on Wednesday, the National Park Service is diligently scrubbing the pool—recently renovated, to the cost of $34 million—before refilling it with water treated with more ozone to head off any future algae. The whole process will cost $100,000.