CHARLOTTE (AP) — The whitewater channels at the U.S. National Whitewater Center in North Carolina have reopened six weeks after a visitor died from a brain-eating amoeba.

The center reopened Wednesday morning after weeks of cleaning and testing.

It closed its whitewater rafting course June 23 after 18-year-old Lauren Seitz of Westerville, Ohio, died from an infection caused by the amoeba. Channels at the center were drained after the water tested positive for the brain-eating amoeba.

Mecklenburg County health officials have a plan to monitor water at the center, which installed a new chlorination system to kill microbes. The county will watch the center weekly through August, and reduce visits in September for the rest of the year.