The pools operated by the Sunset Empire Park and Recreation District were closed Thursday after the district received two reports from pool patrons that they suffered from a parasite that can cause diarrhea.

Following a treatment that will kill cryptosporidium, the pool will re-open Friday morning, said General Manager Justin Cutler.

One of the cases of cryptosporidium has been confirmed by a lab, but the other case has not yet been confirmed.

Cutler voluntarily closed the district’s two swimming pools and the therapy pool after he and Aquatic Supervisor Genesee Dennis spoke with the Clatsop County Public Health Department and the Oregon Health Authority.

To kill the parasite, the district will hyper-chlorinate the pool, which is the procedure recommended by the federal Centers for Disease Control and Prevention.