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“You can buy test strips at a hardware store or a big box store,” she said. She said a box of 100 can cost just a few dollars. “They have little pads on them. You dip them in the water and the pads change color dep on the pH or chlorine or bromine levels,” she said.

Drinking water is chlorinated, but not at the levels needed to make pools safe. A swimming pool should have 1 part per million of chlorine, while a hot tub should have 3 parts per million.

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