RIO DE JANEIRO (AP) — Olympic officials say they will drain the larger pool at the Maria Lenk Aquatics Center to remove the green-tinged water.

The director of venue management, Gustavo Nascimento, says clean water from a nearby practice pool will be transferred to the main pool in time for the start of synchronized swimming on Sunday.

Nascimento says the move is necessary to ensure clear water for both judges and competitors during synchronized swimming.

The water in the adjacent diving well turned a dark shade of green on Tuesday. The larger pool — used for water polo and synchronized swimming — began to turn the same color the following day.

The diving pool will remain in use. Officials say there's no health risk for the athletes.