Crews have partially refilled the pool to flush remaining feeder pipes, and the signs warn the cleanup could temporarily discolor the water as buildup is cleared.
The plumbing problems are central to the Trump administration’s rationale for the restoration project, which has already run into peeling paint and algae blooms.
The pool has been drained twice since work began, most recently in mid-July, underscoring continuing setbacks in restoring one of Washington’s best-known landmarks.