The best way is the K2006 kit. You have to order it; we haven't heard of any pool stores selling them locally: http://pool9.net/tk/
You can test where your chlorine usage is coming from however. Evening to morning loss is something in the water; morning to evening on sunny days is usually mostly sun. If you are stable overnight, but lose during the day, you almost certainly need more stabilizer. The easiest way is to use dichlor, which adds 9 ppm of stabilizer for every 10 ppm of chlorine. See http://pool9.net/sams-dichlor24
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