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How would you test for chlorine?

Updated: 9/16/2023
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12y ago

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You'll need a test kit or test strips.

OTO drops (turn yellow) are available cheaply at places like Walmart, and provides a reliable and fairly easy to read test.

Test strips use a chemical, syringaldazine, that turns bluish. This is also a reliable test for chlorine, but is not quite as easy to read. Also, the other parts of pool test strips, especially the alkalinity and stabilizer pads are NOT reliable.

DPD tablets turn pink in the presence of chlorine. They are pretty easy to read, and very reliable for levels of chlorine less than 10 ppm. Above 10, they can 'bleach' out, and read zero, even though the chlorine is very high.

DPD-FAS turns pink when chlorine is tested, and then back to clear as the FAS is drop-counted it. It is the most reliable and accurate method, but also more expensive and 'fiddly'.

For starters, I'd recommend OTO drops.

Pool store types will tell you that OTO doesn't distinguish "Free" and "Total" chlorine, which is true. But, unless you add a bunch of cheap algicide, or something like "Yellow Out", OR let your chlorine levels yo-yo around . . . it doesn't matter on outdoor pools. If you do have "Total chlorine" or, really, "Combined chlorine", simply maintaining a good constant chlorine level for several days will make it 'go away', at least on outdoor pools.

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