If you’ve been to the Lincoln Memorial Reflecting Pool recently, you may have noticed that your reflection looked a little green. That tint was not an art installation or a glitch in your Instagram filters. It was the result of broken water line, according to the National Park Service.

The broken line has “compromised the circulation system in the pool, leading to issues with the water quality, including the growth of algae,” NPS says in a news release.

This isn’t the first time in recent years that they’ve had to drain the nearly seven millions gallons of water (which takes five or six days to fully siphon out of the pool). Algae was a nearly immediate problem after the $34 million renovation of the Reflecting Pool in 2012. And NPS emptied it again in 2017 after a mass duck die-off.

This time around, repairs to the water line and a good scrubbing will take about a week, the Park Service says, and then the pool will be refilled.

It should be back to reflecting by the week of June 16.