The YMCA of Metropolitan Fort Worth closed all its swimming pools at 6 tonight to treat the water against cryptosporidium, the parasite that has sickened at least 20 people.
The treatment, known as hyperchlorination, is a precaution that health officials have recommended to the operators of all public pools.
The 15 pools closed at 6 p.m. and will remain closed Friday, said Hope Caldwell, Fort Worth YMCA marketing director. Officials hope to reopen the pools by noon Saturday, but members should call their local branches to make sure first, she said.
Fourteen of the pools are in Tarrant County and one is in Granbury in Hood County, she said.
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The Arlington YMCA has completed hyperchlorination of its pools, which will be open on Friday, said Sue White, an Arlington YMCA spokeswoman.
Health officials announced Wednesday that water tests confirmed the parasite at Burger's Lake, a popular Fort Worth swimming hole. Officials have confirmed 20 cases. The symptoms include diarrhea and nausea.