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    How to measure chlorine levels of 15-20 ppm for shocking with bleach

    I have a healthy crop of green algae in my 18,000 gallon plaster pool. I want to use bleach to shock. I've measured the CYA at 50, which according to the TFP table requires a chlorine level of 20 ppm. My Taylor test kit only reads levels up 5 ppm. How do you measure higher levels of chlorine?
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